Signal interference handling method and system and apparatus using the same

This application claims the priority benefits of U.S. provisional application Ser. No. 61/290,762, filed on Dec. 29, 2009 and Taiwan application serial no. 99139731, filed on Nov. 18, 2010. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.

1. Field of the Disclosure

The disclosure relates to a signal interference handling method. Particularly, the disclosure relates to a signal interference handling method for handling interference of a home base station (HBS) to a macro/micro cell base station (MBS)-served mobile station (MS) (m-MS), and a system, a HBS and a MS using the same.

2. Description of Related Art

Development of a cellular system has gradually become mature, and presently not only a macro/micro cell base station (MBS) could serve a mobile station (MS), but a home base station (HBS) could also be established within a coverage range of the MBS to serve the MS. The HBS is, for example, a femtocell base station, and a coverage range thereof is partially overlapped with the coverage range of the MBS.

The HBS could be a limited access base station, for example, a closed subscriber group home base station (CSG HBS), which does not allow accessing of the MS of a non-registered or non-member user. When the MBS-served MS (m-MS) approaches the HBS, MBS control signal (coming from the MBS) received by the m-MS could be severely interfered by HBS control signal (corning from the HBS), where the HBS control signal is used to control the MS of its subscriber, and is not used to control the m-MS. Therefore, the HBS control signal is a source of interference of the MBS control signal received by the m-MS.

An exemplary embodiment of the disclosure provides a signal interference handling method, and a system, a home base station (HBS) and a mobile station (MS) using the same. The signal interference handling method is adapted to a cellular system, where the cellular system includes a macro/micro cell base station (MBS), a HBS, and a MBS-served mobile station (m-MS), where the MBS includes a relay station within an extending signal range thereof, and the signal interference handling method includes following steps. The m-MS detects whether there is mutual interference. The m-MS sends an interference mitigation (IM) request to the HBS when there is mutual interference. The HBS enters a low duty mode (LDM) after the HBS receives the IM request.

An exemplary embodiment of the disclosure provides a signal interference handling method, which is adapted to a m-MS of a cellular system, and the signal interference handling method includes following steps. The m-MS receives MBS signal, where the MBS signal comes from a MBS of the cellular system. The m-MS determines whether there is mutual interference according to the received MBS signal. The m-MS sends an IM request to a HBS of the cellular system when there is mutual interference.

An exemplary embodiment of the disclosure provides a signal interference handling method, which is adapted to a HBS of a cellular system, and the signal interference handling method includes following steps. After the HBS receives an IM request, the HBS enters a LDM, where the IM request is sent by a m-MS of the cellular system when the m-MS detects mutual interference.

An exemplary embodiment of the disclosure provides a signal interference handling method, which is adapted to a HBS of a cellular system, and the signal interference handling method includes following steps. After the HBS receives an IM request, the HBS communicates with a MBS of the cellular system, and sets transmission power and a fractional frequency reuse (FFR) duration of a frequency partition of HBS signal in a FFR setting, where the IM request is sent by a m-MS of the cellular system when the m-MS detects mutual interference, and the HBS operates at a communicated frequency partition during the FFR duration.

An exemplary embodiment of the disclosure provides a signal interference handling method, which is adapted to a HBS of a cellular system, and the signal interference handling method includes following steps. After the HBS receives an IM request, the HBS sends a MBS signal request to a MBS of the cellular system, where the IM request is sent by a m-MS of the cellular system when the m-MS detects mutual interference. After the HBS sends the MBS signal request, the HBS receives MBS signal from the MBS. The HBS transmits HBS signal and the MBS signal to the m-MS in a multiplexing transmission mode.

An exemplary embodiment of the disclosure provides a cellular wireless communication system, which is adapted to handle signal interference. The cellular wireless communication system includes a macro/micro cell base station (MBS), a home base station (HBS) and a MBS-served mobile station (m-MS). The m-MS detects whether there is mutual interference, and the m-MS sends an interference mitigation (IM) request to the HBS when there is mutual interference. The HBS enters a low duty mode (LDM) after the HBS receives the IM request.

An exemplary embodiment of the disclosure provides a mobile station (MS), which is adapted to handle signal interference. The MS receives macro/micro cell base station (MBS) signal, where the MBS signal comes from a MBS. The MS determines whether there is mutual interference according to the received MBS signal. The MS sends an interference mitigation (IM) request to a home base station (HBS) when there is mutual interference.

An exemplary embodiment of the disclosure provides a home base station (HBS), which is adapted to handle signal interference. After the HBS receives an interference mitigation (IM) request, the HBS enters a low duty mode (LDM), where the IM request is sent by a macro/micro cell base station (MBS)-served mobile station (m-MS) when the m-MS detects an interference.

An exemplary embodiment of the disclosure provides a home base station (HBS), which is adapted to handle signal interference. After the HBS receives an interference mitigation (IM) request, the HBS communicates with a macro/micro cell base station (MBS), and sets transmission power and a fractional frequency reuse (FFR) duration of a frequency partition of HBS in a FFR setting, where the IM request is sent by a MBS-served mobile station (m-MS) when the m-MS detects mutual interference, and the HBS operates at a communicated frequency partition during the FFR duration.

An exemplary embodiment of the disclosure provides a home base station (HBS), which is adapted to handle signal interference. After the HBS receives an interference mitigation (IM) request, the HBS sends a macro/micro cell base station (MBS) signal request to a MBS, where the IM request is sent by a MBS-served mobile station (m-MS) when the m-MS detects mutual interference. After the HBS sends the MBS signal request, the HBS receives MBS signal from the MBS. The HBS transmits HBS signal and the MBS signal to the m-MS in a multiplexing transmission mode.

According to the above descriptions, the exemplary embodiments of the disclosure provide a plurality of the signal interference handling methods for mitigating or handling the interference of the HBS signal to the MBS signal, and a system, a HBS and a MS using the same. According to the signal interference handling methods, the m-MS closed to the HBS could correct receive the MBS signal.

In order to make the aforementioned and other features and advantages of the disclosure comprehensible, several exemplary embodiments accompanied with figures are described in detail below.

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram illustrating a cellular system according to an exemplary embodiment of the disclosure.

FIG. 2 is a flowchart illustrating a signal interference handling method according to an exemplary embodiment of the disclosure.

FIG. 3 is a flowchart illustrating a method for confirming authentication of an interference mitigation (IM) requestor according to an exemplary embodiment of the disclosure.

FIG. 4 is a flowchart of a signal interference handling method provided by an exemplary embodiment of the disclosure executed on a macro/micro cell base station (MBS)-served mobile station (m-MS).

FIG. 5 is a flowchart of a signal interference handling method provided by an exemplary embodiment of the disclosure executed on a home base station (HBS).

FIG. 6 is a flowchart of a signal interference handling method according to an exemplary embodiment of the disclosure.

FIG. 7 is a flowchart of a signal interference handling method provided by an exemplary embodiment of the disclosure executed on a home base station (HBS).

FIG. 8 is a flowchart of a signal interference handling method according to an exemplary embodiment of the disclosure.

FIG. 9 is a schematic diagram of a HBS transmission frame according to an exemplary embodiment of the disclosure.

FIG. 10 is a flowchart of a signal interference handling method provided by an exemplary embodiment of the disclosure executed on a home base station (HBS).

FIG. 11 is a flowchart of a signal interference handling method provided by an exemplary embodiment of the disclosure executed on a m-MS.

Firstly, referring to FIG. 1 , FIG. 1 is a schematic diagram illustrating a cellular system according to an exemplary embodiment of the disclosure. The cellular system 1 includes a macro/micro cell base station (MBS) 11 , a home base station (HBS) 12 , a MBS-served mobile station (m-MS) 13 (served by the MBS 11 ) and a MS 14 (served by the HBS 12 ), where the HBS 12 is, for example, a closed subscriber group home base station (CSG HBS) or a femtocell base station, and a coverage range 15 of the HBS 12 is partially overlapped to a coverage range of the MBS 11 . When the m-MS 13 approaches to the HBS 12 , MBS signal (comes from the MBS 11 ) received by the m-MS 13 is probably interfered by HBS signal (corning from the HBS 12 ). The MBS signal and the HBS signal could be control signals or data signals of the system. Therefore, exemplary embodiments of the disclosure provide a plurality of signal interference handling methods for mitigating or handling the interference of the HBS signal to the MBS signal, so that the m-MS 13 could correctly receive the MBS signal.

Referring to FIG. 2 , FIG. 2 is a flowchart illustrating a signal interference handling method according to an exemplary embodiment of the disclosure, in which the steps marked by dot lines are non-necessary steps. In step S 201 , the MBS 11 sends a MBS signal to the m-MS 13 . In the present exemplary embodiment, the MBS signal is a system control signal. Then, in step S 202 , the m-MS 13 detects whether there is mutual interference according to the received MBS signal. When the m-MS 13 approaches to the HBS 12 , the MBS signal could be severely interfered by the HBS signal, so that the MBS signal received by the m-MS 13 could be incorrect. Therefore, the m-MS 13 could determine whether there is mutual interference by decoding, demodulating the received MBS signal or estimating a signal to interference and noise ratio (SINR).

In the exemplary embodiment of FIG. 2 , it is assumed that the m-MS 13 detects the mutual interference, so that in step S 203 , the m-MS 13 sends an interference mitigation (IM) request to the HBS 12 . After the HBS 12 receives the IM request, the HBS 12 directly enters a low duty mode (LDM), where a LDM duration and an activating-deactivating pattern of a LDM setting are predetermined LDM duration and activating-deactivating pattern. The LDM duration is an operation duration of the LDM, and the LDM activating-deactivating pattern represents an interlaced distribution of activating periods and deactivating periods in the LDM duration. If the LDM duration is set unlimited or there is no restriction on the LDM duration, it means that the HBS 12 will operate in the LDM continually until receiving any event, signalling or command to stop the LDM.

Another possible implementation is that after the HBS 12 receives the IM request, the HBS 12 first determines whether there is any serving mobile station (MS) within the coverage range of the HBS 12 , and if there is no serving MS, and there is no MS performing network entry or network re-entry within the coverage range of the HBS 12 , the HBS 12 enters the LDM.

However, in order to avoid a situation that a malicious m-MS sends the IM request to the HBS 12 , in the exemplary embodiment of FIG. 2 , before the HBS 12 enters the LDM, a step S 204 is executed, though the step S 204 is not a necessary step. In the step S 204 , the HBS 12 confirms an authentication of the IM requestor (i.e. the m-MS 13 ) from the MBS 11 , and only when the HBS 12 successfully confirms the authentication of the IM requestor, a step S 2051 is executed. In the step S 2051 , the HBS 12 sets the LDM duration and the activating-deactivating pattern of the LDM setting. Generally, the LDM setting is a predetermined LDM setting (i.e., the predetermined LDM duration and activating-deactivating pattern are used).

In step S 2052 , the HBS 12 enters the LDM, and during the activating period of the LDM duration, the HBS 12 is operated in a normal mode, and during the deactivating period of the LDM duration, the HBS 12 and the member MS of the HBS 12 within the coverage range thereof are forbidden to receive signal from a wireless channel and transmit signal to the wireless channel. However, the MBS 11 may continually transmit the MBS signal to the m-MS 13 . For example, in step S 206 , the MBS 11 transmits another MBS signal to the m-MS 13 . Then, in step S 207 , the m-MS 13 detects whether there is mutual interference. In this exemplary embodiment, it is assumed that there is mutual interference, so that a step S 208 is executed.

In the step S 208 , the m-MS 13 sends the IM request to the HBS 12 . Similarly, in order to avoid the situation that the malicious m-MS sends the IM request to the HBS 12 , in the exemplary embodiment of FIG. 2 , before the HBS 12 executes the step S 2053 , a step S 209 is firstly executed, though the step S 209 is not a necessary step. In the step S 209 , the HBS 12 confirms the authentication of the IM requestor (i.e., the m-MS 13 ) from the MBS 11 , and only when the HBS 12 successfully confirms the authentication of the IM requestor, the step S 2053 is executed. In the step S 2053 , the HBS 12 determines whether the LDM setting is required to be adjusted, and if the LDM is required to be adjusted, the HBS 12 reconfigures the LDM duration and the activating-deactivating pattern of the LDM setting. Then, in step S 2054 , the HBS 12 is continually operated in the LDM.

It should be noticed that each time when the LDM setting is adjusted, the HBS 12 could also transmit response signal to the member MS of the HBS 12 within the coverage range thereof, so that the member MS of the HBS 12 within the coverage range thereof could obtain the interlaced distribution of the activating periods and the deactivating periods in the LDM duration. Moreover, the LDM described in the exemplary embodiment of the disclosure could be a LDM of an IEEE 802.16 system, though the LDM is not limited to the LDM of the IEEE 802.16 system. In other wireless communication standards, although a name of the LDM could be different, as long as an actual effect thereof is the same, it is considered to be within the scope of the disclosure.

The cellular system 1 is, for example, an IEEE 802.16m system, and the IM request is an advanced air interface ranging request (AAI-RNG-REQ) with an indication of femto interference mitigation. In another exemplary embodiment, the HBS 12 enters the LDM only when there is no serving MS within its coverage range and there is no MS performing network entry or network re-entry within its coverage range.

Moreover, when the cellular system 1 is the IEEE 802.16m system, the aforementioned activating period is a service available interval (AI), and the deactivating period is a service unavailable interval (UAI). When the HBS 12 enters the LDM, the HBS 12 is operated in the normal mode during the AI, and the HBS 12 does not transmit any signal to the air interface during the UAI. The HBS 12 transmits an advanced air interface registration response (AAI-REG-RSP) to the member MS of the HBS 12 within the coverage range thereof, so that the member MS of the HBS 12 within the coverage range thereof could obtain the interlaced distribution of the AI and the UAI in the LDM duration. In other words, the AAI-REG-RSP is a message carrying LDM parameter configuration information.

Referring to FIG. 3 , FIG. 3 is a flowchart illustrating a method for confirming an authentication of the IM requestor according to an exemplary embodiment of the disclosure. In step S 301 , when the m-MS 13 detects the interference, the m-MS 13 sends the IM request to the HBS 12 , and the IM request may include a m-MS identification and an authentication message. In another exemplary embodiment, the HBS 12 may request the m-MS identification and the authentication message from the m-MS 13 after receiving the IM request.

The step S 304 includes a step S 302 and a step S 303 . In the step S 302 , the HBS 12 sends the m-MS identification and the authentication message to the MBS 11 . If the MBS 11 determines that the m-MS 13 is a legitimate user according to the m-MS identification and the authentication message, the step S 303 is executed. If the MBS 11 determines that the m-MS 13 is an illegitimate user according to the m-MS identification and the authentication message, the MBS 11 sends a rejection message to the HBS 12 . In the present exemplary embodiment, it is assumed that the MBS 11 determines that the m-MS 13 is a legitimate user according to the m-MS identification and the authentication message. Therefore, in the step S 303 , the MBS 11 sends a confirmation message to the HBS 12 , so that the HBS 12 could successfully confirm the authentication of the IM requestor.

Referring to FIG. 4 , FIG. 4 is a flowchart of the signal interference handling method provided by the exemplary embodiment of the disclosure executed on the m-MS. In step S 401 , the m-MS 13 receives the MBS signal. Then, in step S 402 , the m-MS 13 detects whether there is mutual interference. If the m-MS 13 does not detect the mutual interference, the signal interference handling method is ended, and if the m-MS 13 detects the mutual interference, a step S 403 is executed. In the step S 403 , the m-MS 13 sends the IM request to the HBS 12 . As described above, the IM request may include the m-MS identification and the authentication message. In the IEEE 802.16 system, the IM request is represented by an indication of femto interference mitigation.

Referring to FIG. 5 , FIG. 5 is a flowchart of the signal interference handling method provided by the exemplary embodiment of the disclosure executed on the HBS, in which the steps marked by dot lines are non-necessary steps, and if the non-necessary determination-type steps are not executed, determination results thereof could be determined according to system predetermined values. First, in step S 501 , the HBS 12 receives the IM request. Then, in step S 502 , the HBS 12 determines whether or not to confirm an authentication of the IM requestor. If the HBS 12 successfully confirms the authentication of the IM requestor, a step S 503 is executed, and if the HBS 12 does not successfully confirm the authentication of the IM requestor, the whole signal interference handling method is ended. As described above, the step S 502 is executed to avoid a situation that a malicious m-MS sends the IM request, and the step S 502 could be removed from the signal interference handling method.

In the step S 503 , the LDM duration and the activating-deactivating pattern in the LDM setting are set. After the setting is completed, a step S 504 is executed. In the step S 504 , the HBS 12 is operated in the LDM during the LDM duration. In step S 505 , the HBS 12 determines whether the LDM duration is ended. If the HBS 12 determines that the LDM duration is ended, a step S 506 is executed, and if the HBS 12 determines that the LDM duration is not ended, a step S 508 is executed. The steps S 505 and S 506 are non-necessary steps. In another exemplary embodiment, the HBS 12 may not end the LDM. In the step S 506 , the HBS 12 ends the LDM, and is continually operated in the normal mode.

In the step S 508 , the HBS 12 determines whether the IM request is received during the activating period. If the HBS 12 receives the IM request during the activating period, a step S 507 is executed, and if the HBS 12 does not receive the IM request during the activating period, the step S 504 is executed, so that the HBS 12 is continually operated in the LDM using the previous LDM setting. In the step S 507 , the HBS 12 determines whether or not the LDM setting is required to be adjusted. If the HBS 12 determines that the LDM setting is required to be adjusted, the step S 503 is executed, by which the LDM setting is adjusted, and after the step S 503 , the step S 504 is executed, so that the HBS 12 is operated in the LDM using the new LDM setting. If the HBS 12 determines that the LDM setting is not required to be adjusted, the step S 504 is executed, so that the HBS 12 is continually operated in the LDM using the previous LDM setting.

Generally, if the HBS 12 still receives the IM request during the activating period, it represents that the mutual interference is not effectively mitigated, so that the HBS 12 increases a ratio of the deactivating period, so as to mitigate the signal interference. However, in case that the mutual interference is not effectively mitigated is not considered, the steps S 507 and S 508 could be removed form the signal interference handling method. In overall, in the exemplary embodiment of FIG. 5 , the steps S 502 , S 505 -S 508 are non-necessary steps.

Referring to FIG. 6 , FIG. 6 is a flowchart of a signal interference handling method according to an exemplary embodiment of the disclosure, in which the step marked by dot lines is a non-necessary step. Steps S 601 -S 604 are identical to the steps S 201 -S 204 of FIG. 2 , so that detailed descriptions thereof are not repeated, where the step S 604 is also a non-necessary step of the signal interference handling method. In step S 605 , the HBS 12 communicates with the MBS 11 , and sets transmission power and a fractional frequency reuse (FFR) duration of a frequency partition of the HBS signal in a FFR setting, the FFR refers to that the BS further divides its applicable frequency band, and the divided small frequency bands could be repeatedly used in different communication ranges according to communication demands, environments, conditions and settings, or could be shared by other BSs. Therefore, the frequency used by the HBS 12 for transmitting the HBS signal could be different to a frequency of the MBS signal. Then, in step S 606 , the HBS 12 is operated at a communicated frequency partition during the FFR duration, i.e., the HBS 12 uses the frequency and the transmission power of a frequency partition result to transmit the HBS signal.

Referring to FIG. 7 , FIG. 7 is a flowchart of the signal interference handling method provided by the exemplary embodiment of the disclosure executed on the HBS, in which the steps marked by dot lines are non-necessary steps, and if the non-necessary determination-type steps are not executed, determination results thereof could be determined according to system predetermined values. Steps S 701 and S 702 are identical to the steps S 501 and S 502 of FIG. 5 , so that detailed descriptions thereof are not repeated, where the step S 702 is also a non-necessary step of the signal interference handling method. In step S 703 , the HBS 12 communicates with the MBS 11 , and sets the transmission power and the FFR duration of the frequency partition of the HBS signal in the FFR setting. Then, in step S 704 , the HBS is operated at the communicated frequency partition during the FFR duration, i.e., the HBS 12 uses the frequency and the transmission power of the frequency partition result to transmit the HBS signal.

Then, in step S 705 , the HBS 12 detects whether the FFR duration is ended. If the FFR duration is ended, a step S 706 is executed, and in the step S 706 , the HBS 12 is operated in an original frequency (a frequency used before the FFR setting is set or a default frequency), and uses the original frequency to transmit the HBS signal. If the FFR duration is not ended according to the step S 705 , it is to return to the step S 703 , and each time before the HBS signal is transmitted, the frequency partition, the transmission power and the FFR duration of the FFR setting are set first.

Referring to FIG. 8 , FIG. 8 is a flowchart of a signal interference handling method according to an exemplary embodiment of the disclosure, in which the step marked by dot lines is a non-necessary step. Steps S 801 -S 804 are identical to the steps S 201 -S 204 of FIG. 2 , so that detailed descriptions thereof are not repeated, where the step S 804 is also a non-necessary step of the signal interference handling method. In step S 805 , the HBS 12 sends a signal request to the MBS 11 . In step S 806 , after the MBS 11 receives the signal request, the MBS 11 sends the MBS signal to the HBS 12 . In step S 807 , the HBS 12 transmits the HBS signal and the MBS signal to the m-MS 13 in a multiplexing transmission mode, where the multiplexing transmission mode is to perform different channel encoding to the MBS signal and the HBS signal, and add the encoded MBS signal and the HBS signal for transmitting to the m-MS 13 . In other words, the HBS 12 forwards the MBS signal to the m-MS 13 . The MBS signal and the HBS signal could be respectively added with a weight thereof, and then the two signals are added to obtain a weighted adding result. If the weights of the two signals are both a unit weight (for example, the weight is equal to 1), a non-weighted adding result is obtained.

Referring to FIG. 9 , FIG. 9 is a schematic diagram of a HBS transmission frame according to an exemplary embodiment of the disclosure. In FIG. 9 , a HBS frame 91 transmitted by the HBS 12 includes encoded HBS signal 92 and encoded MBS signal 93 . The encoded HBS signal 92 and the encoded MBS signal 93 are superposed and transmitted to the m-MS 13 . The superposition of multiple encoded signals could be achieved by adding them together, which is also a method of signal multiplexing. Since the channel encodings used in the encoded HBS signal 92 and the encoded MBS signal 93 are different, the m-MS 13 could successfully decode and differentiate the MBS signal from the superposed signal according to the channel encoding used in the encoded MBS signal 93 .

Referring to FIG. 10 , FIG. 10 is a flowchart of a signal interference handling method provided by the exemplary embodiment of the disclosure executed on the HBS, in which the steps marked by dot lines are non-necessary steps, and if the non-necessary determination-type steps are not executed, determination results thereof could be determined according to system predetermined values. Steps S 1001 and S 1002 are identical to the steps S 501 and S 502 of FIG. 5 , so that detailed descriptions thereof are not repeated, where the step S 1002 is also a non-necessary step of the signal interference handling method. In step S 1003 , the HBS 12 requests the MBS 11 to provide the MBS signal. In step S 1004 , the HBS 12 receives the MBS signal. In step S 1005 , the HBS 12 transmits the HBS signal and the MBS signal to the m-MS 13 in the multiplexing transmission mode.

In step S 1006 , the HBS 12 detects whether the MBS 11 has to provide other MBS signal to be transmitted. If the MBS 11 has to provide other MBS signal to be transmitted, the step S 1004 is returned, and the HBS 12 receives the other MBS signal. If the MBS 11 does not have to provide other MBS signal to be transmitted, a step S 1007 is executed. In the step S 1007 , it is detected whether the HBS 12 still requires the MBS 11 to provide other MBS signal. If the HBS 12 still requires the MBS to provide the other MBS signal, then it is return to the step S 1003 , by which the HBS 12 continually requests the MBS 11 to provide the MBS signal. If the HBS 12 does not require the MBS 11 to provide the other MBS signals, the signal interference handling method is ended. The steps 1006 and 1007 are non-necessary steps, which could be removed in other exemplary embodiments.

Referring to FIG. 11 , FIG. 11 is a flowchart of the signal interference handling method provided by the exemplary embodiment of the disclosure executed on the m-MS. Steps S 1101 and S 1102 are identical to the steps S 401 and S 402 of FIG. 4 , so that detailed descriptions thereof are not repeated. In step S 1103 , the m-MS 13 regenerates a waveform of the HBS signal. In step S 1104 , the m-MS 13 subtracts the regenerated waveform of the HBS signal from a superposed waveform of the HBS signal and the MBS signal, so as to eliminate the interference of the HBS signal to the MBS signal.

In summary, the exemplary embodiments of the disclosure provide a plurality of the signal interference handling methods for mitigating or handling the interference of the HBS signal to the MBS signal, and a system, a HBS and a MS using the same. According to the signal interference handling methods, the m-MS closed to the HBS could correctly receive the MBS signal.

It will be apparent to those skilled in the art that various modifications and variations could be made to the structure of the disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims and their equivalents.