CN102340744B - Method and system for transmitting multimedia broadcast multicast service (MBMS) access probability factor - Google Patents
Method and system for transmitting multimedia broadcast multicast service (MBMS) access probability factor Download PDFInfo
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Abstract
The invention discloses a method and a system for transmitting a multimedia broadcast multicast service (MBMS) access probability factor. The method comprises that: a network side bears access probability factor (PF) information at a position corresponding to PF information position information for identifying the bearing position of the PF information for transmission, wherein the PF information is not born in a multicast control channel (MCCH). By the method provided by the invention, the PF information is not born in the MCCH for transmission, so the influence of updating incapability of the MCCH in an MCCH modification period on the fast variability of the PF information in long term evolution (LTE) is avoided, and the accurate implementation of a mechanism for counting the receiving conditions of a certain MBMS on a user side by the network side is ensured.
Description
Technical Field
The present invention relates to a statistical technique in Multimedia Broadcast Multicast Service (MBMS) technology, and more particularly, to a method and system for transmitting an MBMS access probability factor.
Background
With the rapid development of the internet and the popularization of large-screen multifunctional mobile phones, a large number of mobile data multimedia services and various high-bandwidth multimedia services, such as: video conferencing, television broadcasting, video on demand, video advertising, online education, interactive games, and the like. These mobile data multimedia services and various high bandwidth multimedia services not only meet the ever-increasing service demands of mobile users, but also bring new service growth points for mobile operators. These mobile data multimedia services and various high bandwidth multimedia services require that multiple users can receive the same data at the same time, and compared with general data services, the mobile data multimedia services have the characteristics of large data volume, long duration, sensitive time delay and the like.
In order to effectively utilize mobile network resources, the third generation partnership Project (3 GPP) proposes a Multimedia Broadcast Multicast Service (MBMS), which is a technology for transmitting data from one data source to a plurality of destinations, and implements sharing of network (including core network and access network) resources and improves utilization of network resources (especially air interface resources). The MBMS service defined by 3GPP can not only implement multicast and broadcast of plain text low-rate message types, but also implement broadcast and multicast of high-speed multimedia services, and provide a variety of rich video, audio, and multimedia services, which undoubtedly follows the development trend of future mobile data, and provides a better service prospect for the development of third Generation (3G, 3rd Generation) digital communication.
In the MBMS technology, there is a mechanism for a network side to count a reception situation at a User Equipment (UE) side for a certain MBMS service. In the MBMS counting process of the existing mechanism, statistics information (e.g., counted MBMS service information) and access Probability Factor (PF) information are two main statistics information, which are carried in the same information unit and simultaneously sent to the UE, wherein the PF information is mainly set to prevent a large number of UEs from participating in uplink feedback at the same time, thereby causing a shortage of uplink resources. For example, the MBMS service information and the PF information that need to be counted are simultaneously carried in an information unit, such as MBMS access information (MBMS access information), and the information unit is sent to the UE through a Multicast Control Channel (MCCH).
In the prior art, the MCCH mechanism allows part of the INFORMATION to be updated during the MCCH modification period, for example, the MBMS ACCESS INFORMATION in the MCCH is allowed to be updated, and actually the PF INFORMATION in the MBMS ACCESS INFORMATION is changed. In this way, the existing mechanism can meet the requirement of fast update of PF information, so that the statistical information and the PF information can be put together and then sent in the MCCH.
The prior art mentioned above refers to the specification of the R6/R7 standard protocol version of 3 GPP.
However, in Long Term Evolution (LTE), the MCCH is currently defined differently from the prior art, and the LTE defines that the MCCH cannot be updated in one MCCH modification period, that is, in LTE, PF information carried in the MCCH cannot be changed in one MCCH modification period. In addition, in LTE, the above statistical information is not necessarily carried in MCCH transmission.
In the two main statistical information in the statistical process, the change period of PF information is far shorter than the MCCH modification period, the counted MBMS service information changes slowly, and hardly changes in one statistical period; the PF information changes rapidly, and multiple times of PF information needs to be sent in one statistical period to adjust the feedback quantity of the UE in the statistical process. Therefore, in LTE, since the MCCH cannot be updated in one MCCH modification period, the PF information cannot be sent in the MCCH simultaneously with the MBMS service information to be counted, otherwise, a mechanism for network side counting the reception of a certain MBMS service at the UE side cannot be implemented correctly, so that the UE cannot obtain the counting information correctly.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for sending an MBMS access probability factor, which can provide a guarantee for correct implementation of a mechanism for network side statistics on a UE side receiving situation of a certain MBMS service, so as to ensure that a UE obtains statistical information correctly.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for transmitting a Multimedia Broadcast Multicast Service (MBMS) access probability factor, the method further comprising:
and carrying the access Probability Factor (PF) information at a position corresponding to PF information position information for identifying the carrying position of the PF information, and sending the PF information which is not carried in the MCCH.
The PF information location information is carried in MCCH or system information block 13SIB 13.
The PF information position information is: and transmitting information of a radio frame and/or a subframe of the PF information.
The radio frame of the PF information comprises a PF radio frame period and a PF radio frame offset of the PF information, and when the following formula is met, the radio frame number corresponding to the SFN is the radio frame of the PF information:
SFN mod PF radio frame period PF radio frame offset;
where mod represents the modulo operation.
The information of the sub-frame of the PF information is: indicating subframe indication information for carrying the PF information within a radio frame of the PF information.
The subframe indication information is a subframe number; or, after the partial sub-frames are renumbered, the relative positions of the partial sub-frames are indicated.
And the PF radio frame offset is greater than or equal to the radio frame offset of the MCCH corresponding to the PF radio frame offset.
Sending the number of times that the PF information is sent in the MCCH modification period or the repetition period corresponding to the PF information in the MCCH;
the PF radio frame period is the result of the quotient of the MCCH modification period or the repetition period and the times.
The method further comprises the following steps: carrying out modulation coding processing on the loaded PF information by using a modulation and coding mode which is the same as that of the MCCH;
alternatively, the SIB13 is increased with a modulation and coding scheme level indicating the use of PF information.
The method for sending the PF information comprises the following steps: in the position indicated by the PF information position information, a Multimedia Access Control (MAC) CE form is adopted, and the PF information position information is transmitted through a multicast transmission channel (MCH) after an appointed logical channel identifier is used; or,
the method adopts the form of MAC service data unit SDU, and sends the SDU through a multicast transmission channel MCH after using the appointed logical channel identification mark.
The PF information is transmitted later than the MCCH corresponding to the PF information, and the value of the time interval is larger than the time required by the UE for analyzing the information in the MCCH.
The position indicated by the PF information position information is a multimedia broadcast multicast service single frequency network (MBSFN) subframe or a non-MBSFN subframe.
The method further comprises the following steps: and the network side loads the counted MBMS information in the counting information corresponding to the PF information in a multicast control channel MCCH for sending.
A method for sending Multimedia Broadcast Multicast Service (MBMS) access probability factors comprises the following steps:
when the network side determines that the counted MBMS service information in the counting information is sent in the MCCH, PF information position information used for identifying the bearing position of the PF information is sent in the MCCH;
the location indicated by the PF information location information is not in the MCCH.
A method for sending Multimedia Broadcast Multicast Service (MBMS) access probability factors comprises the following steps:
when the network side determines that the counted MBMS service information in the counting information is sent in the MCCH, PF information position information used for identifying the bearing position of the PF information is sent in the MCCH;
the position indicated by the PF information position information is not in the MCCH;
the PF information location information is represented by a period of PF information, which is an interval between the MCCH for transmitting the counted MBMS service information and the occurrence location of the first PF information, and an interval between PF information.
The interval is larger than the processing time delay of the UE receiving the MCCH containing the counted MBMS service information.
The PF information location information is carried in MCCH or system information block 13SIB 13.
A system for transmitting a Multimedia Broadcast Multicast Service (MBMS) access probability factor comprises a network side and a user side, wherein,
a network side, configured to send a location corresponding to PF information location information, where the access probability factor PF information is carried in a carrying location for identifying PF information, to a user side, where the PF information is not carried in an MCCH;
and the user side is used for receiving the information from the network side.
The PF information position information is: sending information of a radio frame and/or a subframe of the PF information;
the PF information location information is carried in MCCH or system information block 13SIB 13.
The network side is further configured to perform modulation and coding processing on the carried PF information in a modulation and coding manner the same as that of the MCCH;
alternatively, the SIB13 is increased with a modulation and coding scheme level indicating the use of PF information.
The PF information is sent through a multicast transmission channel MCH in a position indicated by the PF information position information in a form of a Multimedia Access Control (MAC) CE by using an agreed logic channel identifier; or,
the method adopts the form of MAC service data unit SDU, and sends the SDU through a multicast transmission channel MCH after using the appointed logical channel identification mark.
The network side is as follows: an evolution base station, or a relay station, or a cell cooperative entity MCE, or a broadcast multicast service center BMSC, or an MBMS gateway;
the user side is a user terminal UE or a relay station.
The network side is further configured to bear the counted MBMS service information in the statistics information corresponding to the PF information in a multicast control channel MCCH for transmission.
It can be seen from the above technical solutions that, a network side carries PF information at a location corresponding to PF information location information for identifying a carrying location of the PF information, and the PF information is not carried in the MCCH. By the method, as the PF information is not carried in the MCCH for transmission, the influence of the rapid change of the PF information caused by the fact that the MCCH cannot be updated in an MCCH modification period in LTE is avoided, and the method provides guarantee for the correct implementation of a mechanism for counting the receiving condition of a certain MBMS service at a user side at a network side. Therefore, when the user side receives the counted MBMS information in the statistical information loaded in the MCCH, the user side acquires the transmitted PF information from the corresponding position according to the received PF information position information used for identifying the loading position of the PF information.
Drawings
Fig. 1 is a flowchart of a method of transmitting an MBMS access probability factor according to the present invention;
fig. 2 is a diagram illustrating a location of MBMS statistics according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a flowchart of a method for sending an MBMS access probability factor according to the present invention, as shown in fig. 1, including:
step 100: and the network side loads the counted MBMS information in the counting information in the MCCH and sends the MBMS information. It should be noted that, in the prior art, according to the specification of R6/R7 standard protocol version of 3GPP, the statistical information including the MBMS service information is carried and sent in MCCH; however, in LTE, the statistics are not necessarily carried on MCCH transmissions. Therefore, the present invention does not limit the transmission method of the MBMS service information, and the transmission method is not used to limit the protection scope of the present invention.
Step 101: and carrying the PF information at a position corresponding to PF information position information for identifying the carrying position of the PF information, wherein the PF information is not carried in the MCCH.
In the MBMS counting process, a network side loads the counted MBMS information in the MCCH for transmission; meanwhile, the network side carries the PF information location information for identifying the carrying location of the PF information in the MCCH or system information block 13(SIB13) to transmit, that is, in the present invention, the network side indicates the location of the PF information transmission counted this time through the MCCH or SIB13, and the indicated location of transmitting the PF information is not in the MCCH.
The network side may be: an evolved node b (eNB), a relay (relay), a cell Coordination Entity (MCE), a Broadcast Multicast Service Center (BMSC), a MBMS gateway (MBMS GW, MBMS gateway), and the like.
By the method, as the PF information is not carried in the MCCH and is sent, the influence on the quick change of the PF information caused by the fact that the MCCH cannot be updated in an MCCH modification period in LTE is avoided, and the method provides guarantee for the correct implementation of a mechanism for counting the receiving condition of a certain MBMS service at a user side by a network side. Therefore, when the user side receives the counted MBMS information in the statistical information loaded in the MCCH, the user side acquires the transmitted PF information from the corresponding position according to the received PF information position information used for identifying the loading position of the PF information, and the PF information is not loaded in the MCCH, so that the user side is ensured to correctly acquire the statistical information. The user side may be a user terminal (UE), or a relay (relay).
Fig. 2 is a schematic diagram of positions of MBMS statistical information in an embodiment of the present invention, where a longer column indicates a timing of an MCCH modification period (that is, the modification period of an MCCH where information in the MCCH may be allowed to be updated, and multiple MCCH repetition periods exist between the MCCH modification periods, that is, MCCH information may be sent multiple times between the MCCH modification periods and MCCH information is not allowed to be updated), and the MCCH of the first longer column configures counted MBMS service information and carries PF information position information at the same time. Among them, the PF information location information will be a series of PF information location information (including radio frame and subframe information), such as the shorter column shown in fig. 2, which indicates the location where the PF information is sent, and is sent at least once in the process of one statistical feedback, and fig. 2 shows a schematic diagram of sending for many times. The PF information may be changed every time.
Specifically, in the method of the present invention, the PF information location information sent by the network side in the MCCH or SIB13 is: and transmitting information of a radio frame and/or a subframe of the PF information. In this way, the radio frames and/or subframes for transmitting the PF information do not carry the PF information at ordinary times, and only when the network side transmits the counted MBMS service information, the PF information transmitted later is transmitted in the radio frames and/or subframes. In other words, after the statistical feedback is over, the radio frames and/or subframes for carrying PF information do not carry PF information any more, and the UE does not receive PF information in the radio frames and/or subframes.
When the MCCH is adopted to send the position information of the PF information corresponding to the MCCH, whether the MBMS service information which is counted is carried in the MCCH is taken as the beginning of an MBMS counting process, if the network side determines to carry the counted MBMS service information in the MCCH, the network side simultaneously carries the position information which is sent by the PF information corresponding to the network side in the MCCH. When the counting process is finished, the MCCH does not send the counted MBMS service information and the PF information location information any more, and further, when the network side needs to finish the counting process, the PF information may be set to zero to indicate that the MBMS counting process is finished.
The method for sending the PF information comprises the following steps: in the selected subframe, an appointed logical channel identification mark is used in a Multimedia Access Control (MAC) Control unit (CE) mode and then is sent to the UE through a multicast transmission channel (MCH); or, the MAC Service Data Unit (SDU) is adopted, and the MAC Service Data Unit is sent to the UE through a multicast transmission channel (MCH) after using the appointed logical channel identification mark.
The radio frame information of the PF information is used to describe which radio frames are radio frames carrying the PF information. In the method of the invention, the radio frame bearing the PF information can be represented by the PF radio frame period of the PF information and the PF radio frame offset of the PF information, and the radio frame is taken as a unit. Such as: the PF wireless frame period of the PF information is 16 wireless frames (denoted as rf16), each wireless frame in LTE is 10ms in length, wherein 10 subframes are contained, and the duration of each subframe is 1 ms; therefore, 16 radio frames represent 160 ms; the PF wireless frame offset value is an integer of 0-10; the radio frame carrying PF information is determined by equation (1):
SFN mod PF radio frame period PF radio frame offset (1)
Where mod represents the modulo operation. As can be seen from formula (1), when the SFN value satisfies formula (1), the radio frame number (SFN) corresponding to the SFN is the radio frame carrying the PF information. And the PF wireless frame offset is greater than or equal to the wireless frame offset of the MCCH corresponding to the PF information.
When the radio frame carrying the PF information is determined according to the formula (1), in LTE, two parameters, namely a radio frame period and a radio frame offset, of the PF information need to be added to SIB13 or MCCH. Further, the signaling overhead can be reduced by implicit means, for example, only the radio frame period of the PF information can be introduced into SIB13, and the PF radio frame Offset of the PF information is set (implicitly) equal to the radio frame Offset (MCCH-Offset) of the MCCH corresponding to the PF information, so that one less parameter can be sent, thereby reducing the signaling overhead.
When the MCCH is used to carry the radio frame and/or subframe information of the PF information, a corresponding information unit, a radio frame period and a radio frame offset parameter for carrying the PF information, and subframe information for carrying the PF information carried in the radio frame may be added to the MCCH. The corresponding implicit ways are also applicable to the loading of the radio frame and/or subframe information of the PF information in the MCCH, one of which implicit ways is: sending the number of times of sending the PF information in the MCCH modification period or repetition period in the MCCH, then converting the number of times into a radio frame period of the PF information, wherein the radio frame Offset containing the PF information is equal to the Offset (MCCH-Offset) of the MCCH, and thus determining the radio frame position of the PF information; and further indicating which sub-frame in the radio frame is used for carrying the PF information in the MCCH.
The radio frame period of the PF information may be a value directly indicating the size thereof; the period of the PF information may also be given in an indirect manner, for example, the number of times that the PF information is sent in one MCCH modification period or MCCH repetition period is determined, for example, the PF information is sent 8 times in one MCCH modification period, then the period of the PF information may be determined by dividing the MCCH modification period by 8, at this time, the number of times that the PF information is sent may be configured in the SIB13, and the radio frame period of the PF is replaced.
Further, since there are 10 subframes unused in the radio frame, even if only MBSFN subframes in the radio frame are used to carry PF information, at most, there are 6 MBSFN subframes unused in one radio frame, and specifically which subframe carries PF information, further indication is needed, so that correspondingly, subframe indication information where PF information is located needs to be added to SIB 13. The specific implementation method is that the subframe number is indicated: which subframe number is directly indicated; or, after the partial subframes are renumbered, the relative positions of the subframes are indicated, for example, when the MBSFN subframes are used to carry PF information, the 6 subframes which may be MBSFN subframes are renumbered from 1 to 6, and then the new subframe numbers are indicated. In addition, it is also possible to agree that a certain subframe is fixedly used, so that the UE does not need to be notified of subframe information about PF information.
Further, the load-bearing of the PF information needs to be modulated and encoded to ensure the reliability of its transmission, and the method of the present invention further includes: the PF information carried is modulated and encoded using the same Modulation and Coding Scheme (MCS) as the MCCH information. Alternatively, an MCS level parameter indicating the use of PF information is added in the SIB 13.
Since PF information is related to MBMS service, if adopting MBSFN sub-frame to transmit PF information, it will not affect the transmission and reception of non-MBMS service, therefore, the position of transmitting PF information in the invention selects MBSFN sub-frame preferentially. Of course, non-MBSFN subframes may also be used in the present invention.
In order to ensure that the statistical feedback process of the UE is more reasonable, in practical application, the position of the PF information of the present invention may be:
when the MCCH is used for bearing the radio frame and/or subframe information of the counted MBMS information and the PF information, the position of the subframe where the PF information appears is delayed by more than 4ms after the subframe bearing the counted MBMS information, namely, the PF information is transmitted later than the corresponding MCCH, and the value of the time interval is larger than the time required by the UE for analyzing the information in the MCCH. Thus, the UE receives the MCCH and analyzes the radio frame and/or subframe information of the counted MBMS service information and PF information therefrom (the UE analysis process can be completed within 4ms in actual application), and at this time, the network side just starts to send the PF information, so the UE can receive the PF information, and the rationality of the counting feedback process of the UE side is ensured. Otherwise, if the network side configures the subframe of the PF information to be immediately after (within 4 ms) the subframe of the MCCH (in which the radio frame and/or subframe information of the statistical information and the PF information are configured), when the UE is analyzing the statistical information in the MCCH and the radio frame and/or subframe information of the PF information, the network side sends the PF information for the first time, and at this time, the UE does not know the position of the PF information sent by the network side because the UE has not analyzed the radio frame and/or subframe information of the statistical information and the PF information yet, so the UE misses the opportunity of receiving the PF information.
In addition, since the counted MBMS service information and the radio frame and/or subframe information of the PF information carried in the MCCH occur at the same time, if the network side does not need to perform the counting feedback at ordinary times, the counted MBMS service information may not occur in the MCCH, and accordingly, the radio frame and/or subframe information of the PF information may not occur in the MCCH. Of course, the radio frame and/or subframe information of the PF information carried in the MCCH may also be used as a frequently-allocated item of the MCCH, that is, the radio frame and/or subframe information of the PF information is always configured in the MCCH, and when the network side needs to initiate MBMS statistics feedback, the network side may add the counted MBMS service information in the MCCH, so that after the UE finds the counted MBMS service information in the MCCH, it is known that the network side initiates MBMS statistics feedback, thereby triggering the UE to read the radio frame and/or subframe information of the PF information.
Aiming at the method of the invention, the invention also provides a system for sending the MBMS access probability factor, which comprises a network side and a user side, wherein,
a network side, configured to send a location corresponding to PF information location information, where the access probability factor PF information is carried in a carrying location for identifying PF information, to a user side, where the PF information is not carried in an MCCH; and the apparatus is further configured to bear the counted MBMS service information in the statistical information corresponding to the PF information in a multicast control channel MCCH for transmission.
And the user side is used for receiving the information from the network side.
The PF information position information is as follows: sending information of a radio frame and/or a subframe of the PF information;
the PF information location information is carried in MCCH or system information block 13SIB 13.
The network side is further configured to perform modulation and coding processing on the carried PF information in a modulation and coding manner the same as that of the MCCH;
alternatively, the SIB13 is increased with a modulation and coding scheme level indicating the use of PF information.
The PF information is sent in a position indicated by the PF information position information in a form of a Multimedia Access Control (MAC) CE, and is sent through a multicast transmission channel (MCH) after an appointed logical channel identifier is used; or, the MAC service data unit SDU is adopted and sent through a multicast transmission channel MCH after using the appointed logical channel identification mark.
The network side is as follows: an evolution base station, or a relay station, or a cell cooperative entity MCE, or a broadcast multicast service center BMSC, or an MBMS gateway. The user side is a user terminal UE or a relay station.
The process of the present invention will be described in detail with reference to examples.
The first embodiment: in the invention, aiming at the reason that the information carried in the MCCH can not be modified in the MCCH modification period in LTE, the invention particularly provides that slowly-changed counted MBMS service information is carried in the MCCH, or some marks are made on the MBMS service which needs to be counted and fed back in the MCCH, for example, an indication bit is introduced into each MBMS service in the MCCH to indicate whether the MBMS service needs to be counted and fed back or not. Then, the fast-changing PF information is carried in SIB13 to be sent to UE instead of MCCH, and radio frame and/or subframe information describing the accurate position of PF information is carried in SIB 13. The specific configuration of the PF information is described below.
For LTE, it is assumed that three parameters are added in SIB13 for describing radio frame and/or subframe information of PF information. The three parameters include a radio frame period of the PF information, a radio frame offset of the PF information, and subframe indication information of the PF information. Specifically, the three parameters satisfy formula (1), that is, a radio frame period of SFN mod PF information is equal to a radio frame offset of PF information, where a radio frame corresponding to a system radio frame Number (SFN, SystemFrame Number) value is taken, that is, a radio frame predetermined by PF information. The value range of the radio frame period of the PF information is a set consisting of a plurality of 16, 32, 64, 128, 256 and 512, and the value range of the radio frame offset parameter of the PF information is an integer of 0-10.
Further, since 10 subframes are included in one radio frame, and at most 6 subframes can be configured as MBSFN subframes according to the specification of the LTE protocol, the PF information is specifically transmitted in that subframe within the radio frame, and is described by using the subframe indication information of the PF information. This makes it possible to uniquely determine the subframe for transmitting the PF information. The subframe indication information of the PF information may specifically be:
if only MBSFN subframes are used to carry PF information, 3 bits are used, wherein the values 1, 2, 3, 4, 5, and 6 corresponding to three bits in Frequency Division Duplex (FDD) correspond to subframes #1, #2, #3, #6, #7, #8, respectively, and the values 1, 2, 3, 4, and 5 corresponding to three bits in Time Division Duplex (TDD) correspond to one subframe #3, #4, #7, #8, and #9, respectively. If a non-MBSFN subframe can be used, 4 bits are used to indicate the subframe number therein. It should be noted that, if the subframe information is specified as a certain subframe, the parameter of configuring the subframe indication information for transmitting the PF information in the SIB13 is omitted.
The radio frame period information of the PF information may be given in other manners, for example, a radio frame period of the PF information is replaced with a repetition number of the PF information, the repetition number of the PF information is an occurrence number of the PF information, and describes a number of occurrences of the PF information in an MCCH repetition period or an MCCH modification period, and at this time, the radio frame period of the PF information may be obtained by dividing the MCCH repetition period or the modification period by the repetition number of the PF information. The formula (1) is then continuously used to determine the radio frame location of the PF information.
If the value of the radio frame Offset parameter of the PF information is implicitly included by the radio frame Offset (MCCH-Offset) parameter of the MCCH corresponding to the PF information, that is, the value of the radio frame Offset parameter of the PF information is equal to the value of the radio frame Offset (MCCH-Offset) parameter of the MCCH corresponding to the PF information, at this time, the radio frame Offset of the PF information does not need to occur in the SIB13, thereby saving signaling overhead.
Following the implications and conventions described above, the present invention presents two preferred ways of determining PF information. Namely: the first one is: adding the number of occurrences of the PF information in the SIB13, where the parameter value set is a set consisting of a plurality of 2, 4, 8, 16, 32, and 64, the number of occurrences of the PF information is used to describe the number of occurrences of the PF information in one MCCH repetition period or modification period, and obtaining the radio frame period of the PF information by dividing the MCCH repetition period or modification period by the number of occurrences. And the radio frame offset of the PF information is agreed to be equal to the radio frame offset of the corresponding MCCH. Thus, the radio frame information of the PF information can be determined using equation (1). The subframe information of the PF information is also implemented by convention, for example, in LTE, FDD defines a certain downlink subframe (e.g., subframe #2) of a radio frame, and TDD defines a certain downlink subframe (e.g., subframe # 1) of a radio frame;
the second way is: the location of the PF information is determined by increasing the number of occurrences of the PF information and the subframe indication information of the PF information in the SIB 13. The meaning and the usage of these two parameters have been described above and will not be described herein.
When the MCCH is used for bearing the radio frame and/or subframe information of the counted MBMS information and the PF information, the position of the subframe where the PF information appears is delayed by more than 4ms after the subframe bearing the counted MBMS information, namely, the PF information is transmitted later than the corresponding MCCH, and the value of the time interval is larger than the time required by the UE for analyzing the information in the MCCH.
Besides, since the counted MBMS service information and the radio frame and/or subframe information of the PF information carried in the MCCH occur at the same time, if the network side does not need to perform the counting feedback at ordinary times, the counted MBMS service information may not occur in the MCCH, and accordingly, the radio frame and/or subframe information of the PF information does not occur in the MCCH. Of course, the radio frame and/or subframe information of the PF information carried in the MCCH may also be used as a frequently-allocated item of the MCCH, that is, the radio frame and/or subframe information of the PF information is always configured in the MCCH, and when the network side needs to initiate MBMS statistics feedback, the network side may add the counted MBMS service information in the MCCH, so that after the UE finds the counted MBMS service information in the MCCH, it is known that the network side initiates MBMS statistics feedback, thereby triggering the UE to read the radio frame and/or subframe information of the PF information.
In addition, the SIB13 configures the radio frame and/or subframe information carrying the PF information, specifically, the radio frame and/or subframe information carrying the PF information may be configured in the SIB13 by the network side in advance, but the UE does not retrieve and receive information on the radio frame and/or subframe configured for the PF information in advance until the UE does not receive an indication of MBMS service statistics feedback sent by the network side. Thus, after the network side sends the indication of starting the MBMS statistics feedback, the network side does not need to update the SIB13, thereby simplifying the flow of the network side. The indication to start the MBMS counting feedback may be by discovering that the counted MBMS service information occurs in the MCCH.
Second embodiment: the same parameter configuration as in the first embodiment is to place the parameters in the first embodiment in the MCCH for carrying, that is, configure the radio frame period of the PF information or the number of occurrences of the PF information, the radio frame offset of the PF information, and the subframe information of the PF information in the MCCH. The configuration and usage of the parameters are the same as those in the SIB13 in the first embodiment, and some implicit ways and parameter configuration considerations, such as the configuration of the radio frame offset parameter of the PF information, the subframe of the PF information, the MCCH configuration considerations, and the like. Since the UE with non-MBMS capability does not receive the MCCH, the MCCH is used for bearing the radio frame and/or subframe information for sending the PF information, thereby better avoiding the influence on the UE with non-MBMS capability.
In addition, configuring the radio frame and/or subframe information carrying the PF information in the MCCH can also obtain the advantage that the radio frame and/or subframe information of the PF information is configured in the MCCH only when the network side configures the counted MBMS service information in the MCCH. If the network side does not configure the counted MBMS information in the MCCH, the radio frame and/or subframe information of the PF information is also not configured in the MCCH. Therefore, the signaling efficiency of the network side is reduced, and unnecessary overhead of the signaling of the network side is reduced. Of course, the present invention does not exclude the implementation that when the network side does not configure the counted MBMS service information in the MCCH, the radio frame and/or subframe information of the PF information is configured in the MCCH.
The third embodiment: configuring PF information position information by using two parameters, wherein one is an interval between an MCCH for sending counted MBMS service information and a position where PF information appears for the first time, and the interval can be described by the length of a radio frame or a subframe; another period of the PF information, which is an interval between pieces of PF information, may be described by how many radio frame or subframe durations are spaced. Reference may be made in particular to fig. 2. Wherein,
the interval configuration needs to consider the processing delay of the UE after receiving the MCCH containing the counted MBMS service information, the processing of the UE generally needs 2-3 ms, namely the duration of 2-3 subframes, and the interval needs to be larger than the processing delay;
the period range of the PF information is a set consisting of a plurality of rf16, rf32, rf64, rf128, rf256 and rf512, rfn indicates a duration of n radio frames (where n is 16, 32, 64, 128, 256 and 512), and in LTE, the radio frame is 10ms and indicates 16 radio frames.
In the third embodiment, the two parameters may be sent to the UE through the MCCH or SIB13 for configuration bearer. The requirements of the configuration refer to those in the first embodiment and the second embodiment.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (19)
1. A method for transmitting MBMS access probability factor is characterized in that the method also comprises:
carrying access Probability Factor (PF) information at a position corresponding to PF information position information for identifying the carrying position of the PF information, and sending the PF information which is not carried in the MCCH;
wherein, the PF information location information is carried in MCCH or a system information block 13SIB13 and is sent; the PF information position information is: sending information of a radio frame and/or a subframe of the PF information; the radio frame of the PF information comprises a PF radio frame period and a PF radio frame offset of the PF information;
the PF information is transmitted later than the MCCH corresponding to the PF information, and the value of the time interval is larger than the time required for the UE to analyze the information in the MCCH.
2. The method of claim 1, wherein the radio frame number corresponding to the SFN is the radio frame of the PF information when the following equation is satisfied:
SFN mod PF radio frame period PF radio frame offset;
where mod represents the modulo operation.
3. The method of claim 1, wherein the information of the sub-frame of the PF information is: indicating subframe indication information for carrying the PF information within a radio frame of the PF information.
4. The method of claim 3, wherein the subframe indication information is a subframe number; or, after the partial sub-frames are renumbered, the relative positions of the partial sub-frames are indicated.
5. The method of claim 1 or 2, wherein the PF radio frame offset is equal to or greater than a radio frame offset of its corresponding MCCH.
6. The method of claim 1 or 2, wherein the number of times the PF information is transmitted in the MCCH within its corresponding MCCH modification period or repetition period is transmitted;
the PF radio frame period is the result of the quotient of the MCCH modification period or the repetition period and the times.
7. The method of claim 1, further comprising: carrying out modulation coding processing on the loaded PF information by using a modulation and coding mode which is the same as that of the MCCH;
alternatively, the SIB13 is increased with a modulation and coding scheme level indicating the use of PF information.
8. The method of claim 1, wherein the sending method of the PF information is: in the position indicated by the PF information position information, a Multimedia Access Control (MAC) CE form is adopted, and the PF information position information is transmitted through a multicast transmission channel (MCH) after an appointed logical channel identifier is used; or,
the method adopts the form of MAC service data unit SDU, and sends the SDU through a multicast transmission channel MCH after using the appointed logical channel identification mark.
9. The method according to any one of claims 1 to 4, 7 and 8, wherein the position indicated by the PF information position information is a multimedia broadcast multicast service single frequency network (MBSFN) subframe or a non-MBSFN subframe.
10. The method of claim 1, further comprising: and the network side loads the counted MBMS information in the counting information corresponding to the PF information in a multicast control channel MCCH for sending.
11. A method for sending a Multimedia Broadcast Multicast Service (MBMS) access probability factor is characterized by comprising the following steps:
when the network side determines that the counted MBMS service information in the counting information is sent in the MCCH, PF information position information used for identifying the bearing position of the PF information is sent in the MCCH;
the location indicated by the PF information location information is not in the MCCH.
12. A method for sending a Multimedia Broadcast Multicast Service (MBMS) access probability factor is characterized by comprising the following steps:
when the network side determines that the counted MBMS service information in the counting information is sent in the MCCH, PF information position information used for identifying the bearing position of the PF information is sent in the MCCH;
the position indicated by the PF information position information is not in the MCCH;
the PF information location information is represented by a period of PF information, which is an interval between the MCCH for transmitting the counted MBMS service information and the occurrence location of the first PF information, and an interval between PF information.
13. The method of claim 12, wherein the interval is greater than a processing delay of a UE receiving the MCCH containing the counted MBMS service information.
14. The method according to claim 12 or 13, characterized in that the PF information location information is sent in MCCH or system information block 13SIB 13.
15. A system for transmitting MBMS access probability factor is characterized in that the system comprises a network side and a user side, wherein,
a network side, configured to send a location corresponding to PF information location information, where the access probability factor PF information is carried in a carrying location for identifying PF information, to a user side, where the PF information is not carried in an MCCH;
the user side is used for receiving information from the network side;
wherein, the PF information position information is: sending information of a radio frame and/or a subframe of the PF information;
the PF information location information is carried in MCCH or a system information block 13SIB13 and is sent;
the PF information is transmitted later than the MCCH corresponding to the PF information, and the value of the time interval is larger than the time required for the UE to analyze the information in the MCCH.
16. The system of claim 15, wherein the network side is further configured to perform modulation and coding processing on the carried PF information by using a modulation and coding scheme same as that of the MCCH;
alternatively, the SIB13 is increased with a modulation and coding scheme level indicating the use of PF information.
17. The system according to claim 16, wherein the PF information is transmitted through a multicast transport channel MCH using an agreed logical channel identity identifier in a form of a multimedia access control element MAC CE in a position indicated by the PF information position information; or,
the method adopts the form of MAC service data unit SDU, and sends the SDU through a multicast transmission channel MCH after using the appointed logical channel identification mark.
18. The system according to claim 15 or 16, wherein the network side is: an evolution base station, or a relay station, or a cell cooperative entity MCE, or a broadcast multicast service center BMSC, or an MBMS gateway;
the user side is a user terminal UE or a relay station.
19. The system of claim 15, wherein the network side is further configured to send the counted MBMS service information in the statistics information corresponding to the PF information, which is carried in a multicast control channel MCCH.
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| CN101523933A (en) * | 2006-08-22 | 2009-09-02 | 摩托罗拉公司 | Method and apparatus for providing and obtaining broadcast/multicast service feedback |
| EP2182689A2 (en) * | 2008-10-31 | 2010-05-05 | Samsung Electronics Co., Ltd. | Device and method for transmitting downlink control information in a wireless communication system |
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| CN101064864A (en) * | 2006-04-28 | 2007-10-31 | 大唐移动通信设备有限公司 | Method for counting and access controlling in MBMS service |
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