CN102104856B - Method for retransmitting fast associated control channel signaling and base station - Google Patents
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Abstract
The invention provides a method for retransmitting fast associated control channel (FACCH) signaling and a base station for solving the problems that the retransmission mechanism of the conventional FACCH is only suitable for mobile terminals of specific type and has small application range. The method comprises the following steps that: a frame control unit determines whether the FACCH signaling needs to be retransmitted according to the type of the FACCH signaling and the quality of the FACCH; the frame control unit sets a retransmission mark for expressing whether the retransmission is needed in the FACCH signaling according to the determination result, and transmits the FACCH signaling to a baseband processing unit; and the baseband processing unit receives the FACCH signaling, and determines whether to retransmit the FACCH signaling according to the retransmission mark in the FACCH signaling and whether the mobile terminal has the function of retransmitting the FACCH signaling. According to the technical scheme, the retransmission mechanism of the FACCH can be applied to any mobile terminal, so the success rate of FACCH signaling transmission is improved, and the robustness of a link is improved.
Description
Technical field
The present invention relates to the wireless communication technique field, particularly a kind of repeating method of Fast Associated Control Channel signaling and base station.
Background technology
In communications network system, the transmission of signaling is very important.With GSM (Global System for MobileCommunications, global system for mobile communications) network system, be example, in the GSM network system, several logic channels are combined into certain specific type, for transmitting user data or signaling.Wherein, FACCH (Fast Associated Control Channel, Fast Associated Control Channel) channel carrys out the command transmitting data by taking TCH (Traffic Channel, Traffic Channel) channel, specifically can distinguish TCH and FACCH data by stealing flag of frame.Such as the switching flow in communication process, generally to steal frame by FACCH and carry out the command transmitting data.Therefore, the success rate of FACCH transfer of data is very important.
For wireless quality environment preferably, the transmission of signaling generally can be successful, but the bad situation for wireless quality, the signaling loss likely appears, thereby cause the situation of link connection failure to occur, now need signaling to retransmit to guarantee the success rate of signalling, improve the robustness of link.
3GPP R6 (third generation partner program R6,3rd Generation Partnership Project R6) agreement has been stipulated FACCH channel retransmission mechanism, protocol requirement: the command frame sent on the FACCH channel, switching command for example, can send in a short period of time twice, rather than traditional transmission once.The transmission opportunity of RepeatedFACCH piece: the transmission frame number of first BURST that supposes to comprise descending FACCH piece is M, the transmission frame number that comprises so first BURST of descending Repeated FACCH piece is M+8 or M+9, i.e. the transmission of Repeated FACCH piece is and then to send after wireless mouth is sent completely at the FACCH piece opportunity.The mobile terminal object of this agreement regulation is R6 series mobile terminal.Only according to agreement regulation, realized, use non-R6 series mobile terminal test, discovery can cause the signalling confusion, causes and can't get through or the phenomenon such as handoff failure, has a strong impact on the quality of wireless network assessment.
Visible, existing FACCH channel retransmission mechanism is only applicable to the mobile terminal of particular type, and the scope of application is little.
Summary of the invention
The embodiment of the present invention provides a kind of repeating method and base station of Fast Associated Control Channel signaling, is only applicable to the mobile terminal of particular type in order to solve existing FACCH channel retransmission mechanism, the problem that the scope of application is little.
The repeating method of a kind of Fast Associated Control Channel signaling that the embodiment of the present invention provides comprises:
The frame control unit, according to the type of Fast Associated Control Channel FACCH signaling and the quality of FACCH channel, determines whether described FACCH signaling needs to retransmit;
Whether described frame control unit arranges expression according to definite result in described FACCH signaling needs the retransmission flag of retransmitting, and described FACCH signaling is sent to baseband processing unit;
Described baseband processing unit receives described FACCH signaling, and whether has the function of repeating transmission FACCH signaling and the described retransmission flag in described FACCH signaling according to mobile terminal, determines whether to retransmit described FACCH signaling.
Wherein, described frame control unit, according to the type of Fast Associated Control Channel FACCH signaling and the quality of FACCH channel, determines whether described FACCH signaling needs to retransmit, and is specially:
Determine whether described FACCH signaling is command frame, and determine the quality of described FACCH channel according to the quality measurement reports of described FACCH channel;
When the described FACCH signaling quality that is command frame and described FACCH channel does not reach prospective quality, perhaps, when the described FACCH signaling quality measurement reports that is command frame and described FACCH channel is invalid, described frame control unit determines that described FACCH signaling needs to retransmit; When described FACCH signaling is non-command frame, or the described FACCH signaling quality that is command frame and described FACCH channel is while reaching prospective quality, and described frame control unit determines that described FACCH signaling does not need to retransmit.
Described frame control unit, according to determining that result arranges expression and whether needs the retransmission flag of retransmitting in described FACCH signaling, is specially:
When described FACCH signaling need to be retransmitted, it is 1 that described frame control unit arranges retransmission flag in described FACCH signaling;
When described FACCH signaling does not need to retransmit, it is 0 that described frame control unit arranges retransmission flag in described FACCH signaling.
Whether described baseband processing unit has the function of repeating transmission FACCH signaling and the described retransmission flag in described FACCH signaling according to mobile terminal, determines whether to retransmit described FACCH signaling, is specially:
Described baseband processing unit determines whether described mobile terminal has the function of retransmitting the FACCH signaling;
When described mobile terminal has the function of retransmitting the FACCH signaling, described baseband processing unit is determined the described FACCH signaling of repeating transmission; When described mobile terminal does not have the function of retransmitting the FACCH signaling but described retransmission flag while meaning that described FACCH signaling need to be retransmitted, if current, there is other FACCH signaling of the described FACCH signaling of next-door neighbour to need to send, described baseband processing unit is determined and not to be retransmitted described FACCH signaling, if other FACCH signaling that is not close to described FACCH signaling current needs to send, and described baseband processing unit is determined the described FACCH signaling of repeating transmission; When described mobile terminal does not have the function of retransmitting the FACCH signaling and described retransmission flag and means that described FACCH signaling does not need to retransmit, described baseband processing unit is determined and is not retransmitted described FACCH signaling.
Described baseband processing unit determines that whether described mobile terminal has the function of retransmitting the FACCH signaling, is specially:
The parameter of described mobile terminal when described baseband processing unit activates according to channel, judge whether mobile terminal has the function of retransmitting the FACCH signaling.
A kind of base station that the embodiment of the present invention provides comprises:
The frame control unit, be used for according to the type of FACCH signaling and the quality of FACCH channel, determine whether described FACCH signaling needs to retransmit, according to determining that result arranges expression and whether needs the retransmission flag of retransmitting in described FACCH signaling, and described FACCH signaling is sent;
Whether baseband processing unit, for receiving described FACCH signaling, and have the function of repeating transmission FACCH signaling and the described retransmission flag in described FACCH signaling according to mobile terminal, determines whether to retransmit described FACCH signaling.
Wherein, described frame control unit further comprises:
Type is determined subelement, for determining whether described FACCH signaling is command frame;
Quality is determined subelement, determines the quality of described FACCH channel for the quality measurement reports according to described FACCH channel;
First retransmits definite subelement, while for the quality that is command frame and described FACCH channel when described FACCH signaling, not reaching prospective quality, perhaps, when the described FACCH signaling quality measurement reports that is command frame and described FACCH channel is invalid, determine that described FACCH signaling needs to retransmit; When described FACCH signaling is non-command frame, or the described FACCH signaling quality that is command frame and described FACCH channel determines that described FACCH signaling does not need to retransmit while reaching prospective quality.
Described baseband processing unit further comprises:
Function is determined subelement, for determining described mobile terminal, whether has the function of retransmitting the FACCH signaling;
Second retransmit to determine subelement, when having the function of retransmitting the FACCH signaling when described mobile terminal, determines the described FACCH signaling of repeating transmission; When described mobile terminal does not have the function of retransmitting the FACCH signaling but described retransmission flag while meaning that described FACCH signaling need to be retransmitted, if current, there is other FACCH signaling of the described FACCH signaling of next-door neighbour to need to send, determine and do not retransmit described FACCH signaling, if other FACCH signaling that is not close to described FACCH signaling current needs to send, and determines and retransmits described FACCH signaling; When described mobile terminal does not have the function of retransmitting the FACCH signaling and described retransmission flag and means that described FACCH signaling does not need to retransmit, determine and do not retransmit described FACCH signaling.
In addition, described function is determined subelement, and also the parameter of described mobile terminal when activating according to channel, judge whether mobile terminal has the function of retransmitting the FACCH signaling.
The technical scheme that the embodiment of the present invention provides, for having the mobile terminal of retransmitting the FACCH signaling capability, can realize whole repeating transmission of FACCH signaling; For not thering is the mobile terminal of retransmitting the FACCH signaling capability, can realize that selectively the FACCH signaling is retransmitted.And this base station is also compatible existing protocol hierarchy framework, realized by frame control unit (transport layer) the judgement of signaling, the transmission of signaling is realized by baseband processing unit (physical layer).In addition, the frame control unit determines according to the quality of FACCH channel quality whether the FACCH signaling is retransmitted, and can effectively reduce the unnecessary transmission of FACCH channel quality when good, reduces redundant transmission.Visible, the base station that the embodiment of the present invention provides can make FACCH channel retransmission mechanism be applied to any mobile terminal, has improved the success rate of FACCH signalling, has improved the robustness of link.
The accompanying drawing explanation
The flow chart of the repeating method that Fig. 1 is embodiment of the present invention Fast Associated Control Channel signaling;
The concrete grammar flow chart that Fig. 2 is embodiment of the present invention step S101;
The concrete grammar flow chart that Fig. 3 is embodiment of the present invention step S103;
The structural representation that Fig. 4 is embodiment of the present invention base station;
The structural representation that Fig. 5 is embodiment of the present invention frame control unit 401;
The structural representation that Fig. 6 is embodiment of the present invention baseband processing unit 402;
Fig. 7 is embodiment of the present invention gsm system wireless frame structure figure;
The flow chart that Fig. 8 is the specific embodiment of the invention.
Embodiment
The problem existed in order to solve prior art, the embodiment of the present invention provides a kind of repeating method and base station of Fast Associated Control Channel signaling.
As shown in Figure 1, the repeating method of the Fast Associated Control Channel signaling that the embodiment of the present invention provides comprises:
S101, frame control unit, according to the type of FACCH signaling and the quality of FACCH channel, determine whether the FACCH signaling needs to retransmit.
As shown in Figure 2, S101 further comprises the steps:
S201, frame control unit determine whether the FACCH signaling is command frame, and determine the quality of FACCH channel according to the quality measurement reports of FACCH channel;
S202, when the FACCH signaling quality that is command frame and FACCH channel does not reach prospective quality, (prospective quality is determined by system itself, wherein best prospective quality is that the error rate is 0) time, perhaps, when the FACCH signaling quality measurement reports that is command frame and FACCH channel is invalid, the frame control unit determines that the FACCH signaling needs to retransmit; When the FACCH signaling is non-command frame, or the FACCH signaling quality that is command frame and FACCH channel is while reaching prospective quality, and the frame control unit determines that the FACCH signaling does not need to retransmit.
S102, frame control unit arrange according to definite result the retransmission flag whether expression needs repeating transmission, and the FACCH signaling are sent to baseband processing unit in the FACCH signaling.
Such as, when the FACCH signaling need to be retransmitted, it is 1 that the frame control unit can arrange retransmission flag in the FACCH signaling; When the FACCH signaling does not need to retransmit, it is 0 that the frame control unit can arrange retransmission flag in the FACCH signaling.
S103, baseband processing unit receive the FACCH signaling, and whether have according to the retransmission flag in the FACCH signaling and mobile terminal the function of retransmitting the FACCH signaling, determine whether to retransmit the FACCH signaling.
As shown in Figure 3, S103 further comprises the steps:
S301, baseband processing unit determine whether mobile terminal has the function of retransmitting the FACCH signaling.
Wherein, the parameter of mobile terminal when baseband processing unit can activate according to channel, judge whether mobile terminal has the function of retransmitting the FACCH signaling.
S302, when mobile terminal has the function of retransmitting the FACCH signaling, baseband processing unit is determined and is retransmitted the FACCH signaling; When mobile terminal does not have the function of retransmitting the FACCH signaling but retransmission flag while meaning that the FACCH signaling need to be retransmitted, if current, there is other FACCH signaling of next-door neighbour FACCH signaling to need to send, baseband processing unit is determined and not to be retransmitted the FACCH signaling, if other FACCH signaling that is not close to the FACCH signaling current needs to send, and baseband processing unit is determined repeating transmission FACCH signaling; When mobile terminal does not have the function of retransmitting the FACCH signaling and retransmission flag and means that the FACCH signaling does not need to retransmit, baseband processing unit is determined and is not retransmitted the FACCH signaling.
The repeating method of the Fast Associated Control Channel signaling that the embodiment of the present invention provides, for having the mobile terminal of retransmitting the FACCH signaling capability, can realize whole repeating transmission of FACCH signaling; For not thering is the mobile terminal of retransmitting the FACCH signaling capability, can realize that selectively the FACCH signaling is retransmitted.And this repeating method is also compatible existing protocol hierarchy framework, realized by frame control unit (transport layer) the judgement of signaling, the transmission of signaling is realized by baseband processing unit (physical layer).In addition, the frame control unit determines according to the quality of FACCH channel quality whether the FACCH signaling is retransmitted, and can effectively reduce the unnecessary transmission of FACCH channel quality when good, reduces redundant transmission.Visible, the repeating method of the Fast Associated Control Channel signaling that the embodiment of the present invention provides can make FACCH channel retransmission mechanism be applied to any mobile terminal, has improved the success rate of FACCH signalling, has improved the robustness of link.
As shown in Figure 4, the embodiment of the present invention also provides a kind of base station, comprising:
Whether baseband processing unit 402, for receiving the FACCH signaling, and have according to the retransmission flag in the FACCH signaling and mobile terminal the function of retransmitting the FACCH signaling, determines whether to retransmit the FACCH signaling.
The base station that the embodiment of the present invention provides, for having the mobile terminal of retransmitting the FACCH signaling capability, can realize whole repeating transmission of FACCH signaling; For not thering is the mobile terminal of retransmitting the FACCH signaling capability, can realize that selectively the FACCH signaling is retransmitted.And this base station is also compatible existing protocol hierarchy framework, realized by frame control unit (transport layer) the judgement of signaling, the transmission of signaling is realized by baseband processing unit (physical layer).In addition, the frame control unit determines according to the quality of FACCH channel quality whether the FACCH signaling is retransmitted, and can effectively reduce the unnecessary transmission of FACCH channel quality when good, reduces redundant transmission.Visible, the base station that the embodiment of the present invention provides can make FACCH channel retransmission mechanism be applied to any mobile terminal, has improved the success rate of FACCH signalling, has improved the robustness of link.
As shown in Figure 5, frame control unit 401 further comprises:
Type is determined subelement 501, for determining whether the FACCH signaling is command frame;
Quality is determined subelement 502, determines the quality of FACCH channel for the quality measurement reports according to the FACCH channel;
First retransmit to determine subelement 503, for when the FACCH signaling being the quality of command frame and FACCH channel while not reaching prospective quality, or, when the FACCH signaling quality measurement reports that is command frame and FACCH channel is invalid, determines that the FACCH signaling needs repeating transmission; When the FACCH signaling is non-command frame, or the FACCH signaling quality that is command frame and FACCH channel determines that the FACCH signaling does not need to retransmit while reaching prospective quality.
As shown in Figure 6, baseband processing unit 402 further comprises:
Function is determined subelement 601, for determining mobile terminal, whether has the function of retransmitting the FACCH signaling;
Second retransmit to determine subelement 602, when having the function of retransmitting the FACCH signaling when mobile terminal, determines repeating transmission FACCH signaling; When mobile terminal does not have the function of retransmitting the FACCH signaling but retransmission flag while meaning that the FACCH signaling need to be retransmitted, if current, there is other FACCH signaling of next-door neighbour FACCH signaling to need to send, determine and do not retransmit the FACCH signaling, if other FACCH signaling that is not close to the FACCH signaling current needs to send, and determines and retransmits the FACCH signaling; When mobile terminal does not have the function of retransmitting the FACCH signaling and retransmission flag and means that the FACCH signaling does not need to retransmit, determine and do not retransmit the FACCH signaling.
In addition, function is determined subelement 601, and also the parameter of mobile terminal when activating according to channel, judge whether mobile terminal has the function of retransmitting the FACCH signaling.
Below with specific embodiment explanation embodiment of the present invention technical scheme.
The specific embodiment of the invention be take the GSM base station as example, is illustrated in figure 7 the gsm system wireless frame structure, and as shown in Figure 8, the method flow of the specific embodiment of the invention is as described below:
S801, frame control unit arrive FACCH signaling delivery time.
S802, frame control unit determine that whether the FACCH signaling is command frame, determines the quality of FACCH channel according to the quality measurement reports of FACCH channel.
S803, when the FACCH signaling quality that is command frame and FACCH channel does not reach prospective quality, perhaps when the FACCH signaling quality measurement reports that is command frame and FACCH channel is invalid, the frame control unit determines that the FACCH signaling needs to retransmit, and in the mid-retransmission flag of FACCH signaling, is 1; When the FACCH signaling is non-command frame, continuous four quality measurement reports that perhaps the FACCH signaling is command frame and FACCH channel show when the quality of FACCH channel all reaches prospective quality, the frame control unit determines that the FACCH signaling does not need to retransmit, and in the mid-retransmission flag of FACCH signaling, is 0; Send the FACCH signaling.
S804, baseband processing unit receive the FACCH signaling, arrive FACCH frame coding delivery time.
S805, baseband processing unit determine whether to retransmit constantly, judge whether retransmission counter is 0;
Carry out S812 if retransmit (retransmission counter is 0) constantly: the FACCH signaling to be retransmitted that the pointed of encoding is preserved, continue to carry out S809;
Carry out S813 if not retransmit (retransmission counter is not 0) constantly: judgement has or not the FACCH signaling to need to send, and if have the FACCH signaling to send to carry out S806; If need to send and carry out S814 without the FACCH signaling: the fixing infilled frame by the coded frame pointed, continue to carry out S809.
S806, baseband processing unit judge whether mobile phone supports Repeated FACCH function, if support to carry out S808; Otherwise carry out S807.
S807, baseband processing unit are resolved retransmission flag, if do not need, do not retransmit, and carry out S815: putting retransmission counter is 0xff, by coded frame pointed FACCH signaling, continue to carry out S809; Retransmit if need, carry out S808.
S808, baseband processing unit be coded frame pointed FACCH signaling to be sent, and back up this signaling, and put retransmission counter is 2 simultaneously.
S809, baseband processing unit coding send the FACCH signaling.
S810, baseband processing unit judge whether retransmission counter is 0, if putting retransmission counter is 0xff.
S811, baseband processing unit finish FACCH coding transmission processing, and the retransmission counter that is non-zero xff to value is subtracted 1 operation.
The technical scheme that the specific embodiment of the invention utilizes the embodiment of the present invention to provide, make FACCH channel retransmission mechanism be applied to any mobile terminal, improved the success rate of FACCH signalling, improved the robustness of link.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the repeating method of a Fast Associated Control Channel signaling, is characterized in that, comprising:
The frame control unit, according to the type of Fast Associated Control Channel FACCH signaling and the quality of FACCH channel, determines whether described FACCH signaling needs to retransmit;
Whether described frame control unit arranges expression according to definite result in described FACCH signaling needs the retransmission flag of retransmitting, and described FACCH signaling is sent to baseband processing unit;
Described baseband processing unit receives described FACCH signaling, and whether has the function of repeating transmission FACCH signaling and the described retransmission flag in described FACCH signaling according to mobile terminal, determines whether to retransmit described FACCH signaling.
2. repeating method as claimed in claim 1, is characterized in that, described frame control unit, according to the type of Fast Associated Control Channel FACCH signaling and the quality of FACCH channel, determines whether described FACCH signaling needs to retransmit, and is specially:
Determine whether described FACCH signaling is command frame, and determine the quality of described FACCH channel according to the quality measurement reports of described FACCH channel;
When the described FACCH signaling quality that is command frame and described FACCH channel does not reach prospective quality, perhaps, when the described FACCH signaling quality measurement reports that is command frame and described FACCH channel is invalid, described frame control unit determines that described FACCH signaling needs to retransmit; When described FACCH signaling is non-command frame, or the described FACCH signaling quality that is command frame and described FACCH channel is while reaching prospective quality, and described frame control unit determines that described FACCH signaling does not need to retransmit.
3. repeating method as claimed in claim 1, is characterized in that, described frame control unit, according to determining that result arranges expression and whether needs the retransmission flag of retransmitting in described FACCH signaling, is specially:
When described FACCH signaling need to be retransmitted, it is 1 that described frame control unit arranges retransmission flag in described FACCH signaling;
When described FACCH signaling does not need to retransmit, it is 0 that described frame control unit arranges retransmission flag in described FACCH signaling.
4. as claim 1,2 or 3 described repeating methods, it is characterized in that, whether described baseband processing unit has the function of repeating transmission FACCH signaling and the described retransmission flag in described FACCH signaling according to mobile terminal, determines whether to retransmit described FACCH signaling, is specially:
Described baseband processing unit determines whether described mobile terminal has the function of retransmitting the FACCH signaling;
When described mobile terminal has the function of retransmitting the FACCH signaling, described baseband processing unit is determined the described FACCH signaling of repeating transmission; When described mobile terminal does not have the function of retransmitting the FACCH signaling but described retransmission flag while meaning that described FACCH signaling need to be retransmitted, if current, there is other FACCH signaling of the described FACCH signaling of next-door neighbour to need to send, described baseband processing unit is determined and not to be retransmitted described FACCH signaling, if other FACCH signaling that is not close to described FACCH signaling current needs to send, and described baseband processing unit is determined the described FACCH signaling of repeating transmission; When described mobile terminal does not have the function of retransmitting the FACCH signaling and described retransmission flag and means that described FACCH signaling does not need to retransmit, described baseband processing unit is determined and is not retransmitted described FACCH signaling.
5. repeating method as claimed in claim 4, is characterized in that, described baseband processing unit determines that whether described mobile terminal has the function of retransmitting the FACCH signaling, is specially:
The parameter of described mobile terminal when described baseband processing unit activates according to channel, judge whether mobile terminal has the function of retransmitting the FACCH signaling.
6. a base station, is characterized in that, comprising:
The frame control unit, be used for according to the type of FACCH signaling and the quality of FACCH channel, determine whether described FACCH signaling needs to retransmit, according to determining that result arranges expression and whether needs the retransmission flag of retransmitting in described FACCH signaling, and described FACCH signaling is sent;
Whether baseband processing unit, for receiving described FACCH signaling, and have the function of repeating transmission FACCH signaling and the described retransmission flag in described FACCH signaling according to mobile terminal, determines whether to retransmit described FACCH signaling.
7. base station as claimed in claim 6, is characterized in that, described frame control unit further comprises:
Type is determined subelement, for determining whether described FACCH signaling is command frame;
Quality is determined subelement, determines the quality of described FACCH channel for the quality measurement reports according to described FACCH channel;
First retransmits definite subelement, while for the quality that is command frame and described FACCH channel when described FACCH signaling, not reaching prospective quality, perhaps, when the described FACCH signaling quality measurement reports that is command frame and described FACCH channel is invalid, determine that described FACCH signaling needs to retransmit; When described FACCH signaling is non-command frame, or the described FACCH signaling quality that is command frame and described FACCH channel determines that described FACCH signaling does not need to retransmit while reaching prospective quality.
8. base station as described as claim 6 or 7, is characterized in that, described baseband processing unit further comprises:
Function is determined subelement, for determining described mobile terminal, whether has the function of retransmitting the FACCH signaling;
Second retransmit to determine subelement, when having the function of retransmitting the FACCH signaling when described mobile terminal, determines the described FACCH signaling of repeating transmission; When described mobile terminal does not have the function of retransmitting the FACCH signaling but described retransmission flag while meaning that described FACCH signaling need to be retransmitted, if current, there is other FACCH signaling of the described FACCH signaling of next-door neighbour to need to send, determine and do not retransmit described FACCH signaling, if other FACCH signaling that is not close to described FACCH signaling current needs to send, and determines and retransmits described FACCH signaling; When described mobile terminal does not have the function of retransmitting the FACCH signaling and described retransmission flag and means that described FACCH signaling does not need to retransmit, determine and do not retransmit described FACCH signaling.
9. base station as claimed in claim 8, is characterized in that,
Described function is determined subelement, and also the parameter of described mobile terminal when activating according to channel, judge whether mobile terminal has the function of retransmitting the FACCH signaling.
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| Ericsson,3GPP.FACCH Improvements repeated FACCH.《3GPP TSG GETAN #23 Toc GP-050193,FACCH Improvements repeated FACCH》.2005,第3页第2-3行,第7行,第10-11行,第14-22行. * |
| repeated FACCH.《3GPP TSG GETAN #23 Toc GP-050193，FACCH Improvements |
| repeated FACCH》.2005,第3页第2-3行，第7行，第10-11行，第14-22行. |
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