CN117500079A

CN117500079A - MCCH (multipoint control channel) sending method in NR (radio resource control) cell, gNB (serving radio node b) and UE (user equipment)

Info

Publication number: CN117500079A
Application number: CN202210868172.5A
Authority: CN
Inventors: 魏立梅; 陈迎; 范晨; 袁乃华
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2024-02-02

Abstract

The application provides a sending method, gNB and UE of MCCH in NR cell, the method controls the sending frequency of the configuration information of the broadcasting service of each service type through configuring the modification period for each service type of the broadcasting service, further configures the sending times for each service type of the broadcasting service, and controls the sending frequency of the configuration information of the broadcasting service of each service type through different modification periods and different sending times. The method can flexibly and effectively reduce the radio resources occupied by the MCCH, and can also reduce the power consumption of the UE in the process of monitoring the MCCH change notification in some specific scenes.

Description

MCCH (multipoint control channel) sending method in NR (radio resource control) cell, gNB (serving radio node b) and UE (user equipment)

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for transmitting an MCCH in an NR cell, a gNB, and a UE.

Background

With the continuous development of wireless communication technology, new Radio Access (NR) systems have been introduced into people's lives. In order to provide multicast broadcast services (Multicast and Broadcast Service, MBS) in NR cells, release 17Work Item,R17 WI, release 17work item was set up at The third generation partnership project (The 3rd Generation Partnership Project,3GPP) radio access network (Radio Access Network, RAN) in 12, 2019: NR MBS.

Currently, when the configuration information of each broadcast service in an NR cell is sent through an MBS control channel (MBS Control Channel, MCCH), a uniformly configured modification period and a uniformly configured repetition period are adopted. The configuration information of each broadcast service is changed from a start position of one modification period, and the configuration information of each broadcast service is repeatedly transmitted through the MCCH in each repetition period within one modification period. If there is a new broadcast service in the cell in the current modification period or if the configuration information of the existing broadcast service on the MCCH is updated, the base station (gNB) transmits an MCCH modification notification in each repetition period in the current modification period, where the MCCH modification notification is transmitted in a DCI format on the PDCCH scrambled with the MCCH-RNTI by the CRC.

However, due to the many service types of MBS, MBS of different service types have different quality of service (Quality of Service, QOS) requirements. In order to meet QOS requirements of a broadcast service with high reliability requirements and sensitive delay, when configuration information of the broadcast service is transmitted by using the MCCH, a modification period uniformly configured for the MCCH is generally smaller, and a repetition period uniformly configured for each modification period is generally smaller. A smaller modification period and a smaller repetition period mean a larger MCCH transmission frequency, and configuration information of broadcast services with high reliability requirements and sensitive time delay can be frequently transmitted through the MCCH to effectively meet QOS requirements of such broadcast services, but frequent transmission of configuration information of other types of broadcast services through the MCCH causes more and unnecessary consumption of radio resources.

Disclosure of Invention

The application provides a sending method of MCCH (multicast control channel), gNB (serving radio node B) and UE (user equipment) in an NR (radio resource management) cell, so as to solve the problem of more and unnecessary wireless resource consumption caused by frequently sending configuration information of broadcast services of each service type through the MCCH at the same sending frequency in the prior art.

In a first aspect, an embodiment of the present application provides a method for transmitting an MCCH in an NR cell, including:

configuring MCCH modification period T _m And MCCH repetition period T _r An MCCH transmitting window is configured in each MCCH repetition period and used for transmitting MCCH;

configuring a modification period for the broadcast service of each service type;

broadcasting M modification periods of the broadcast service configuration of each service type through the MCCH special SIB;

wherein T is _m And T _r In ms, c=t _m /T _r 。

In one possible design of the first aspect, the configuring a modification period for the broadcast service of each service type includes:

based on QOS requirement of each service type, M modification periods are configured for broadcasting services of N service types in total, wherein M is more than 1 and less than or equal to N;

wherein the mth modification period T _m (m) satisfies the following formula: t (T) _m (m)＝T _m X R (M), m=1,.. R (M) is a positive integer, R (1) =1.

In another possible design of the first aspect, after the configuring modification period for the broadcast service of each service type, the method further includes:

Determining the sending position of the configuration information of the broadcasting service of each service type;

the determining the sending position of the configuration information of the broadcasting service of each service type comprises the following steps:

for the broadcasting services of each service type adopting the mth modification period, the configuration information of the broadcasting services is sent through the MCCH in the first MCCH modification period in each modification period, and the configuration information of the broadcasting services is sent in the MCCH transmitting window in each MCCH repetition period in the first MCCH modification period.

In yet another possible design of the first aspect, after said configuring a modification period for the broadcast service of each service type, the method further comprises:

determining the sending position of the MCCH change notice;

the determining the sending position of the MCCH change notification includes:

for each service type adopting the mth modification period, when at least one broadcast service adopting the mth modification period is newly added in the next modification period or at least one broadcast service adopting the mth modification period is updated in the next modification period, sending an MCCH modification notification in the first MCCH modification period in the next modification period; and sending the MCCH change notification in the MCCH transmitting window in each MCCH repetition period in the first MCCH modification period.

In yet another possible design of the first aspect, after the configuring the modification period for the broadcast service for each service type, the method further includes:

the modification period employed by each broadcast service is provided on the MCCH.

In yet another possible design of the first aspect, the method further comprises:

and broadcasting the QCI value of the service type corresponding to each modification period in the M modification periods through an MCCH special SIB or MCCH.

In yet another possible design of the first aspect, the configuring a modification period for the broadcast service of each service type includes:

configuring a modification period and a transmission frequency for the broadcast service of each service type;

the configuration modification period and the number of transmission times for the broadcast service of each service type include:

based on QOS requirements of each service type, M groups of parameters are configured for broadcasting services of N service types in total, and the M groups of parameters are formed by modification period T _m (m) and the number of transmission times C (m), wherein the number of transmission times C (m) is less than or equal to C;

the broadcasting service of each service type can only select one group of parameters from the M groups of parameters, and the modification period and the transmission times in the selected group of parameters are respectively used as the modification period and the transmission times of the broadcasting service of the service type;

Wherein the mth modification period T _m (m) satisfies the following formula: t (T) _m (m)＝T _m X R (M), m=1,.. R (M) is a positive integer, R (1) =1;

in yet another possible design of the first aspect, R (m) satisfies the following formula: r (m) =2 ^a(m) A (m) is a non-negative integer, a (1) =1;

optionally, after the modification period and the number of transmissions are configured for the broadcast service of each service type, the M modification periods configured for the broadcast service of each service type by the MCCH-specific SIB include:

m groups of parameters configured for broadcast services of each service type are broadcast through MCCH (dedicated information processing channel) special SIB (SIB), and the M groups of parameters are modified by a period T _m (m) and the number of transmissions C (m).

Optionally, after the configuring the modification period and the number of transmissions for the broadcast service of each service type, the method further includes:

for employing the mth modification period T _m Broadcast services of the respective service types of (m) and mth transmission times C (m) are transmitted through MCCH in the MCCH transmission window in the first C (m) MCCH repetition periods in the first MCCH modification period in each modification period.

determining the sending position of the MCCH change notice;

the determining the sending position of the MCCH change notification includes:

for the adoption of T _m (m) and C (m) when at least one of the service types is newly added in the next modification period _m At least one of (m) and C (m) uses T during the next modification period _m And (3) when the configuration information of the broadcast service of (m) and C (m) is updated, sending an MCCH change notification in an MCCH transmitting window in the first C (m) MCCH repetition periods in the first MCCH modification period in the next modification period.

the modification period and the number of transmissions employed per broadcast service are provided on the MCCH.

Optionally, the method further comprises:

and broadcasting the QCI value of the service type corresponding to each modification period/transmission times in the M modification periods/transmission times through an MCCH special SIB or MCCH.

Introducing a coverage indication domain into a DCI format on a PDCCH scrambled by the MCCH-RNTI for CRC, wherein the coverage indication domain consists of one bit;

when the coverage indication domain is 1, the UE uses the configuration information of each broadcast service on the current MCCH to cover the previously stored configuration information of each broadcast service;

when the coverage indication field is 0, the 3GPP R17 UE updates the configuration information of each broadcast service stored before by adopting the configuration information of each broadcast service on the current MCCH.

Optionally, the method further comprises:

when 3GPP R17 UE receives a broadcast service, when the following condition 1 or condition 2 is satisfied, the UE reacquires the MCCH from the latest MCCH repetition period until the coverage indication area in the TMGI of the broadcast service is provided on the MCCH captured by the UE or the DCI format on the PDCCH corresponding to the captured MCCH is 1; when the TMGI of the broadcast service is provided on the MCCH captured by the UE, the UE continues to receive the broadcast service according to the configuration information of the broadcast service on the MCCH; when the coverage indication domain in the DCI format on the PDCCH corresponding to the MCCH captured by the UE is 1, the UE uses the captured configuration information of each broadcast service on the MCCH to cover the configuration information of each broadcast service stored before; if the newly stored configuration information does not contain the configuration information of the broadcast service, the UE determines that the broadcast service is ended, and stops receiving the broadcast service; if the newly stored configuration information contains the configuration information of the broadcast service, the UE continues to receive the broadcast service according to the newly stored configuration information of the broadcast service;

Wherein, condition 1: when the DRX cycle is configured for the broadcast service, the UE does not monitor the PDCCH for scheduling the broadcast service in a plurality of continuous DRX cycles;

condition 2: when the DRX period is not configured for the broadcast service, the UE does not monitor the PDCCH for scheduling the broadcast service in a plurality of continuous PDCCH monitoring periods, wherein the PDCCH monitoring period is a PDCCH monitoring period of a search space in which the PDCCH for scheduling the broadcast service is located.

for a UE supporting multiple modification periods, when the UE decodes the MCCH correctly, the UE determines each modification period corresponding to the current MCCH, and configuration information of broadcast services of each service type corresponding to the modification periods is sent on the current MCCH, and the UE overwrites the configuration information of broadcast services of the service types received before with the configuration information of broadcast services of the service types on the current MCCH.

In a second aspect, embodiments of the present application provide a gNB for implementing the method provided by the first aspect and each possible design.

In a third aspect, an embodiment of the present application provides a UE, where the UE is configured to implement a method of dividing a first aspect by:

In a fourth aspect, an embodiment of the present application provides a UE, where the UE is a 3gpp r17 UE, and the UE is configured to implement the following method:

Or alternatively, the first and second heat exchangers may be,

The embodiment of the application provides a sending method, gNB and UE of MCCH in an NR cell, wherein the method controls the sending frequency of the configuration information of the broadcasting service of each service type through configuring a modification period for each service type of the broadcasting service, further configures the sending times for each service type of the broadcasting service, and controls the sending frequency of the configuration information of the broadcasting service of each service type through different modification periods and different sending times. The method can flexibly and effectively reduce the radio resources occupied by the MCCH, and can also reduce the power consumption of the UE in the process of monitoring the MCCH change notification in some specific scenes.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of an MBS architecture in an NR system provided in the prior art;

fig. 2 is a flow chart of an MCCH transmission method in an NR cell according to an embodiment of the present application;

fig. 3 is a schematic diagram of a transmission position of configuration information of a broadcast service of each service type in the first embodiment of the present application;

fig. 4 is a flow chart of an MCCH transmission method in an NR cell according to a second embodiment of the present application;

fig. 5 is a schematic diagram of a transmission position of configuration information of a broadcast service of each service type provided in the second embodiment of the present application.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Before describing the embodiments of the present application, an application background of the embodiments of the present application will be explained first:

fig. 1 is a schematic diagram of an MBS architecture in an NR system provided in the prior art. As shown in fig. 1, the MBS includes an MBS server, a 5G core network (5G Core Network,5GC), a Next generation RAN (NG-RAN), and User Equipment (UE). Alternatively, the NG-RAN may be represented by gNB.

The MBS server provides MBS. For each MBS, the MBS server transmits the user plane data and the control plane information of the MBS to the 5GC through a user plane interface and a control plane interface between the MBS and the 5GC respectively.

The 5GC provides a user plane data transmission path and a control plane information transmission path for the MBS from the MBS server, and transmits the user plane data and the control plane information of the MBS to the gNB through the two paths respectively.

And the gNB determines an NR cell for transmitting the MBS according to the control plane information of the MBS from the core network, and transmits user plane data of the MBS from the core network in the corresponding NR cell.

When the MBS is a broadcast service, the gNB transmits the MBS in a point-to-Multipoint (PTM) mode in a corresponding NR cell, and transmits the configuration information of the MBS through an MCCH, and transmits the configuration information of the MCCH through an MCCH-dedicated SIB.

When the UE has MBS function, the UE receives the configuration information of the MCCH in the NR cell by the dedicated SIB of the MCCH, then receives the MCCH according to the configuration information of the MCCH, and obtains the configuration information of each broadcasting service broadcasted in the current cell from the MCCH. When the UE is interested in the MBS, the UE may receive the MBS according to configuration information of the MBS.

Currently, when configuration information of each broadcast service in a cell is sent through an MCCH, a uniformly configured modification period and a uniformly configured repetition period are adopted. The configuration information of each broadcast service is changed from a start position of one modification period, and the configuration information of each broadcast service is repeatedly transmitted through the MCCH in each repetition period within one modification period. If there is new broadcast service in the cell in the current modification period or the configuration information of the existing broadcast service on the MCCH is updated, the gNB sends MCCH modification notice in each repetition period in the current modification period, and the MCCH modification notice is sent by DCI format on PDCCH scrambled by MCCH-RNTI through CRC.

However, the service types of MBS are numerous, including: V2X services, software download services, public safety services, TV services, etc. MBS of different traffic types have different QOS requirements: some MBS's have high reliability requirements and are sensitive to latency; some MBS's have high reliability requirements but are not delay sensitive; some MBS's are not highly reliable but are delay sensitive; some MBS's are not highly reliable and are also insensitive to latency. In order to meet QOS requirements of a broadcast service with high reliability requirements and sensitive delay, when configuration information of the broadcast service is transmitted by using the MCCH, a modification period uniformly configured for the MCCH is generally smaller, and a repetition period uniformly configured for each modification period is generally smaller. A smaller modification period and a smaller repetition period mean a larger MCCH transmission frequency, and configuration information of broadcast services with high reliability requirements and sensitive time delay can be frequently transmitted through the MCCH to effectively meet QOS requirements of such broadcast services, but frequent transmission of configuration information of other types of broadcast services through the MCCH causes more and unnecessary consumption of radio resources.

In view of the above problems, the inventive concept of the present application is as follows: the modification period may be configured for each service type broadcast service, where the modification period is a positive integer multiple of the MCCH modification period, and configuration information for one service type broadcast service is transmitted only in a first MCCH modification period in the modification period. The transmission frequency of the configuration information of the broadcasting service of each service type can be controlled by setting the modification period of the broadcasting service of each service type, thereby reducing the radio resource occupied by the MCCH.

The following describes the technical scheme of the present application in detail through specific embodiments.

It should be noted that the following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

Fig. 2 is a flow chart of an MCCH transmission method in an NR cell according to an embodiment of the present application. As shown in fig. 2, the method for transmitting the MCCH in the NR cell may include the steps of:

s201, configuring MCCH modification period T _m And MCCH repetition period T _r And configuring an MCCH transmitting window for transmitting the MCCH in each MCCH repetition period.

Wherein N represents the number of service types of broadcast service provided in a cell, and QOS requirement based on N service types Configuration of MCCH modification period T with other necessary information _m And an MCCH repetition period Tr. Wherein, the MCCH modification period and the MCCH repetition period meet the QOS requirement of the broadcasting service with the strictest time delay requirement and highest reliability requirement.

Alternatively, each length is T _m The MCCH modification period of (ms) contains c=t _m /T _r And has a length T _r (ms) MCCH repetition period, wherein T _m /T _r In ms, c=t _m /T _r 。

Further, an MCCH transmission window is configured in each MCCH repetition period in each MCCH modification period, and the MCCH is transmitted in the MCCH transmission window.

It should be understood that parameters adopted in configuring the MCCH modification period, the MCCH repetition period and the MCCH transmission window are referred to the 3gpp r17 NR MBS-related protocol, and will not be described herein.

S202, a modification period is configured for the broadcast service of each service type.

Wherein, based on QOS requirements and other necessary information of each service type, a total of M modification periods are configured for the broadcast service of N service types, and each modification period has a unit of: ms, and M is more than 1 and less than or equal to N. The modification period of the broadcast service of each service type can only be one of the M modification periods described above.

Exemplary, mth modification period T _m (m) satisfies the following formula:

T _m (m)＝T _m ×R(m)

wherein m=1, & gt. R (m) is a positive integer, R (1) =1.

As can be seen from the above formula, each length is T _m The modification period of (m) ms includes R (m) MCCH modification periods.

Illustratively, R (m) satisfies the following formula:

R(m)＝2 ^a(m)

wherein m=1, & gt. a (m) is a non-negative integer, a (1) =0.

S203, determining the sending position of the configuration information of the broadcasting service of each service type.

In one implementation, for broadcast services of each service type employing the mth modification period, configuration information of the broadcast services is transmitted through the MCCH in a first MCCH modification period in each modification period, and the configuration information of the broadcast services is transmitted in an MCCH transmission window in each MCCH repetition period in the first MCCH modification period.

In this step, the frequency of sending the configuration information of the broadcast services of different service types is controlled through different modification periods, and the radio resources occupied during the MCCH sending can be effectively reduced on the basis of meeting QOS requirements of the broadcast services of different service types.

Fig. 3 is a schematic diagram of a transmission position of configuration information of broadcast services of each service type in the first embodiment of the present application. As shown in fig. 3, the MCCH modification period is T _m =40ms, mcch repetition period T _r =20ms, each MCCH modification period contains c=t _m /T _r =2 MCCH repetition periods, each MCCH repetition period comprising one MCCH transmission window, the MCCH being transmitted within the MCCH transmission window. The broadcast service of each service type is configured with 3 modification periods: t (T) _m (1)＝T _m ＝40ms、T _m (2)＝2T _m =80 ms and T _m (3)＝4T _m ＝160ms。

Wherein, fig. 3 includes 4 MCCH modification periods, 4 lengths T _m (1) A modification period of ms, 2 lengths T _m (2) A modification period of ms and 1 length T _m (3) A modification period of ms. At length T _m (1) The ms modification period includes R (1) =1 MCCH modification periods in total, T is adopted _m (1) Configuration information of broadcast services of respective service types of (a) is transmitted in a unique MCCH modification period in each modification period. At length T _m (2) In total, R (2) =t is contained in the ms modification period _m (2)/T _m =2 MCCH modification periods, with T _m (2) Configuration information of broadcast services of respective service types of (a) is transmitted in a first MCCH modification period in each modification period. At length T _m (3) In total, R (3) =t is included in the ms modification period _m (3)/T _m =4 MCCH modification periods, employT _m (3) Configuration information of broadcast services of respective service types of (a) is transmitted in a first MCCH modification period in each modification period.

S204, determining the sending position of the MCCH change notification.

In one possible implementation manner, for each service type adopting the mth modification period, when at least one broadcast service adopting the mth modification period is newly added in the next modification period, or when at least one configuration information of the broadcast service adopting the mth modification period is updated in the next modification period, an MCCH modification notification is sent in the first MCCH modification period in the next modification period; and sending the MCCH change notification in the MCCH transmitting window in each MCCH repetition period in the first MCCH modification period.

Wherein, sending the MCCH modification notification in the first MCCH modification period in the next modification period may be achieved by: and sending MCCH modification notification by two bits in a DCI format on a PDCCH scrambled by MCCH-RNTI through CRC in an MCCH transmitting window in each MCCH repetition period in the first MCCH modification period. Specifically, when at least one broadcast service adopting the mth modification period is newly added in the next modification period, the more important bit is set to 1; when at least one of the configuration information of the broadcast service employing the mth modification period is updated in the next modification period, another bit is set to 1. The updating of the configuration information of the broadcast service comprises the following steps: the configuration information of the broadcast service changes, the broadcast service stops transmitting, and the configuration information of the neighbor cells of the broadcast service changes.

In this step, the MCCH modification notification is still transmitted in units of the MCCH modification period, which is compatible with the existing MCCH modification notification transmission method. Compared with the existing MCCH change notification transmission method, the transmission frequency of the configuration information of the broadcast service of some service types can be reduced by adopting different modification periods, and correspondingly, the transmission frequency of the MCCH change notification can be reduced, which is beneficial to reducing the power consumption of the UE.

Exemplary, as shown in FIG. 3, T is employed _m (1) Is a new broadcast of (a)The service is T in the 4 th length _m (1) The ms modification period is established, so gNB is at length T4 _m (1) Sending MCCH change notification in each MCCH transmitting window in a ms modification period; by T _m (2) Is set to be T in the length of 2 nd _m (2) Updated in a modification period of ms, so gNB is of length T in the second _m (2) An MCCH modification notice is sent in each MCCH transmitting window in a first MCCH modification period in a ms modification period; by T _m (3) Configuration information of a broadcast service of (1) is of length T _m (3) Updated in the ms modification period, so gNB is of length T _m (3) An MCCH modification notification is sent in each MCCH transmission window in the first MCCH modification period in the ms modification period.

S205, M modification periods of the broadcast service configuration of each service type are broadcasted through the MCCH special SIB.

Optionally, the QCI value of the service type corresponding to each modification period in the M modification periods is broadcasted through an MCCH dedicated SIB or an MCCH.

Wherein, different service types can adopt the same modification period, and one modification period can correspond to a plurality of QCI values. Therefore, the QCI value of the service type corresponding to each of the M modification periods may be broadcast through an MCCH-specific SIB or an MCCH.

S206, providing a modification period adopted by each broadcast service on the MCCH.

S207, introducing a coverage indication domain into a DCI format on a PDCCH scrambled by the MCCH-RNTI by the CRC.

Wherein the coverage indication field consists of one bit.

When the coverage indication domain is 1, the UE uses the configuration information of each broadcast service on the current MCCH to cover the previously stored configuration information of each broadcast service; when the coverage indication field is 0, the 3GPP R17 UE updates the configuration information of each broadcast service stored before by adopting the configuration information of each broadcast service on the current MCCH: for a TMGI on the MCCH, if the UE does not store the TMGI before, the UE determines that the TMGI corresponds to a new broadcast service, and the UE stores the TMGI and configuration information of the broadcast service corresponding to the TMGI on the MCCH; if the UE stores the TMGI before, the UE determines that the configuration information of the broadcasting service corresponding to the TMGI is updated, and the UE replaces the configuration information corresponding to the TMGI stored before with the configuration information of the broadcasting service corresponding to the TMGI on the MCCH; for each TMGI stored by the UE, if the TMGI is not provided on the MCCH, the UE continues to store the TMGI and configuration information of the broadcast service corresponding to the TMGI.

This step was introduced in order to be compatible with 3GPP R17 UE. In this step, a coverage indication field, which consists of 1 bit, needs to be introduced in the DCI format on the PDCCH scrambled with MCCH-RNTI by the CRC. In one 3GPP R17 NR cell, gNB always sets the coverage indication field to 1 in the DCI format on the PDCCH when transmitting the PDCCH scrambled with MCCH-RNTI by CRC; in one 3gpp r18 NR cell, when the MCCH scheduled by the PDCCH carries configuration information of broadcast services of each service type, the gNB sets the coverage indication field to 1, otherwise, the gNB sets the coverage indication field to 0.

Correspondingly, the UE adopts different preservation modes to preserve the configuration information of each broadcasting service on the MCCH according to different values of the coverage indication domain in the DCI format. Specifically, when the coverage indication field is 1, the UE uses the configuration information of each broadcast service on the current MCCH to cover the previously stored configuration information of each broadcast service; when the coverage indication field is 0, the 3GPP R17 UE updates the configuration information of each broadcast service stored before by adopting the configuration information of each broadcast service on the current MCCH: for a TMGI on the MCCH, if the UE does not store the TMGI before, the UE determines that the TMGI corresponds to a new broadcast service, and the UE stores the TMGI and configuration information of the broadcast service corresponding to the TMGI on the MCCH; if the UE stores the TMGI before, the UE determines that the configuration information of the broadcasting service corresponding to the TMGI is updated, and the UE replaces the configuration information corresponding to the TMGI stored before with the configuration information of the broadcasting service corresponding to the TMGI on the MCCH; for each TMGI stored by the UE, if the TMGI is not provided on the MCCH, the UE continues to store the TMGI and configuration information of the broadcast service corresponding to the TMGI.

S208, in the 3gpp r17 NR protocol, the following functions are introduced: when 3GPP R17 UE receives a broadcast service, when the condition 1 or the condition 2 is met, the UE reacquires the MCCH from the latest MCCH repetition period until the coverage indication area in the TMGI of the broadcast service is provided on the MCCH captured by the UE or the DCI format on the PDCCH corresponding to the captured MCCH is 1. And when the TMGI of the broadcast service is provided on the MCCH captured by the UE, the UE continuously receives the broadcast service according to the configuration information of the broadcast service on the MCCH. When the coverage indication domain in the DCI format on the PDCCH corresponding to the MCCH captured by the UE is 1, the UE uses the captured configuration information of each broadcast service on the MCCH to cover the configuration information of each broadcast service stored before. If the newly stored configuration information does not contain the configuration information of the broadcast service, the UE determines that the broadcast service is ended, and stops receiving the broadcast service; if the newly stored configuration information contains the configuration information of the broadcast service, the UE continues to receive the broadcast service according to the newly stored configuration information of the broadcast service.

Condition 1: when the DRX period is configured for the broadcast service, the UE does not monitor the PDCCH for scheduling the broadcast service in a plurality of continuous DRX periods.

Alternatively, for a UE supporting multiple modification periods (i.e., 3GPP R18 UE), the process of this step may also be performed when condition 1 or condition 2 is satisfied. The present application does not restrict this.

S209, for a UE supporting multiple modification periods, when the UE decodes the MCCH correctly, the UE determines each modification period corresponding to the current MCCH, and the configuration information of the broadcast services of each service type corresponding to the modification periods is sent on the current MCCH, and the UE covers the configuration information of the broadcast services of the service types received before with the configuration information of the broadcast services of the service types on the current MCCH.

As shown in fig. 3, the modification period T is carried on the MCCH transmitted in 2 MCCH transmission windows in the first MCCH modification period at the same time _m (1) Modification period T _m (2)And modification period T _m (3) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in the 1/2 th MCCH transmitting window, the UE uses the configuration information of each broadcasting service on the current MCCH to cover the modification period T stored before _m (1) Modification period T _m (2) And modification period T _m (3) Configuration information of each corresponding broadcasting service.

Only the modification period T is carried on MCCH (multipoint control channel) transmitted in 2 MCCH transmitting windows in the second/four MCCH modification periods _m (1) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in the 1/2 th MCCH transmitting window, the UE uses the configuration information of each broadcasting service on the current MCCH to cover the modification period T stored before _m (1) Configuration information of each corresponding broadcasting service.

Carrying modification period T on MCCH (multipoint control channel) transmitted in 2 MCCH transmitting windows in third MCCH modification period _m (1) And modification period T _m (2) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in the 1/2 th MCCH transmitting window, the UE uses the configuration information of each broadcasting service on the current MCCH to cover the modification period T stored before _m (1) And modification period T _m (2) Configuration information of each corresponding broadcasting service.

For the UE supporting multiple modification periods, the UE may monitor the MCCH according to its specific situation after obtaining the configuration information of the MCCH.

When the UE monitors the MCCH by taking the MCCH modification period as a unit, the power consumption of the UE is the same as that when the method is not adopted. When the UE is interested in broadcast services of a certain service type or a plurality of service types, the UE can monitor the MCCH according to the modification period adopted by the service types, and when the modification period adopted by the service types is larger than the MCCH modification period, the UE only needs to monitor a subset of the set formed by all the MCCH modification periods, so that the power consumption of the UE is reduced compared with the method without adopting the application.

In the MCCH transmission method in the NR cell provided in the second embodiment of the present application, on the basis of configuring a modification period for each service type of a broadcast service, the number of transmission times is further configured for each service type of the broadcast service, and the transmission frequency of the configuration information of the broadcast service of each service type is controlled by using different modification periods and different transmission times. In the second embodiment, the radio resource occupied by the MCCH can be further flexibly and effectively reduced, and in some specific scenarios, the method of the present invention can also reduce the power consumption of the UE in the process of monitoring the MCCH modification notification.

Optionally, fig. 4 is a flow chart of an MCCH transmission method in an NR cell provided in the second embodiment of the present application. As shown in fig. 4, the MCCH transmission method in the NR cell may include the steps of:

s401, configuring an MCCH modification period and an MCCH repetition period, and configuring an MCCH transmitting window in each MCCH repetition period for transmitting the MCCH.

By T _m And T _r The MCCH modification period and the MCCH repetition period are respectively represented. Each of length T _m The MCCH modification period of (ms) contains c=t _m /T _r And has a length T _r (ms) MCCH repetition period, wherein T _m /T _r In ms.

It should be understood that the implementation principle and manner of S401 may refer to S201, and will not be described herein.

S402, the modification period and the sending times are configured for the broadcasting service of each service type.

Wherein M groups of parameters consisting of modification period Tm (M) and transmission times C (M) are configured for broadcasting services of N service types in total based on QOS requirement of each service type and other necessary information, T _m The units of (m) are: ms, m=1, … …, M,1 < m.ltoreq.n. The broadcast service of each service type can only select one group of parameters from the M groups of parameters, and the modification period and the transmission times in the selected group of parameters are respectively used as the modification period and the transmission times of the broadcast service of the service type.

Exemplary, mth modification period T _m (m) satisfies the following formula:

T _m (m)＝T _m ×R(m)

wherein m=1, … …, M; r (m) is a positive integer, R (1) =1.

Illustratively, R (m) satisfies the following formula:

R(m)＝2 ^a(m)

wherein m=1, & gt. a (m) is a non-negative integer, a (1) =1.

The m-th transmission times C (m) is less than or equal to C.

The following configuration is allowed among the M sets of parameters configured:

T _m (m1)＝T _m (M2), but C (M1) is not equal to C (M2), M1 and M2 are each positive integers not greater than M.

S403, determining the sending position of the configuration information of the broadcasting service of each service type.

Wherein for employing the mth modification period T _m Broadcast services of the respective service types of (m) and mth transmission times C (m) are transmitted through MCCH in the MCCH transmission window in the first C (m) MCCH repetition periods in the first MCCH modification period in each modification period.

In this step, the frequency of transmitting the configuration information of the broadcast service of each service type is controlled by the modification period and the number of transmissions, so that the radio resource occupied by MCCH transmission can be further reduced compared with the above-described method of controlling the frequency of transmitting the configuration information of the broadcast service of each service type by only the modification period.

Fig. 5 is a schematic diagram of a transmission position of configuration information of a broadcast service of each service type provided in the second embodiment of the present application. As shown in fig. 5, the MCCH modification period is T _m =80 ms, mcch repetition period T _r =20ms, each MCCH modification period contains c=t _m /T _r =4 MCCH repetition periods, each MCCH repetition period containing one MCCH transmission window. 3 sets of parameters are configured for each broadcast service of the service type: t (T) _m (1)＝T _m ＝80ms、C(1)＝4；T _m (2)＝2T _m ＝160ms、C(2)＝4；T _m (3)＝4T _m =320 ms, C (3) =2. By T _m (1) And configuration information of broadcast services of the respective service types of C (1), MCCH transmission windows in C (1) MCCH repetition periods in a unique MCCH modification period in each modification period And (5) internal transmission. By T _m (2) And C (2) the configuration information of the broadcast service of each service type is sent in the MCCH transmitting window in the first C (2) MCCH repetition periods in the first MCCH modification period in each modification period. By T _m (3) And C (3) the configuration information of the broadcast service of each service type is sent in the MCCH transmitting window in the first C (3) MCCH repetition periods in the first MCCH modification period in each modification period.

S404, determining the sending position of the MCCH change notification.

Wherein for the adoption of T _m (m) and C (m) when at least one of the service types is newly added with T in the next modification period _m At least one of (m) and C (m) uses T during the next modification period _m And (3) when the configuration information of the broadcast service of (m) and C (m) is updated, sending an MCCH change notification in an MCCH transmitting window in the first C (m) MCCH repetition periods in the first MCCH modification period in the next modification period.

In a specific implementation, the MCCH modification notification is sent by two bits in the DCI format on the PDCCH scrambled with the MCCH-RNTI by the CRC in the MCCH transmission window in the first C (m) MCCH repetition periods in the first MCCH modification period: when at least one adoption T is newly added in the next modification period _m In the broadcast service of (m) and C (m), the more important bit is set to 1; when at least one of the following modification periods adopts T _m When the configuration information of the broadcast services of (m) and C (m) is updated, another bit is set to 1.

In this step, the MCCH modification notification is still transmitted in units of the MCCH modification period, which is compatible with the existing MCCH modification notification transmission method. Each time the MCCH modification notification is transmitted within one MCCH modification period, the number of times the MCCH modification notification is transmitted is controlled by the corresponding number of times of transmission. Compared with the existing method for sending the MCCH change notification, the method for sending the MCCH change notification can effectively reduce the sending frequency of the MCCH change notification, and is beneficial to reducing the power consumption of the UE.

As shown in FIG. 5, T is employed _m (1) And C (1) =c is at length 2T _m (1) Updates occur during the ms modification period, so gNB has a second length T _m (1) An MCCH modification notice is sent in an MCCH transmitting window in each MCCH repetition period in a unique MCCH modification period in a ms modification period; by T _m (2) And C (2) =c is T at length 2 _m (2) The ms modification period is established, so gNB has a second length T _m (2) An MCCH modification notice is sent in an MCCH transmitting window in each MCCH repetition period in a first MCCH modification period in a ms modification period; by T _m (3) And C (3) =2, a new broadcast service having a length T in the figure _m (3) The modification period of ms is established, so gNB is of length T in the figure _m (3) The MCCH modification notification is sent in the MCCH transmission window in the first C (3) MCCH repetition periods in the first MCCH modification period in the ms modification period.

S405, M modification periods and M sending times of the broadcast service configuration of each service type are broadcasted through the MCCH special SIB.

Optionally, the QCI value of the service type corresponding to each modification period/transmission number of the M modification periods/transmission numbers is broadcasted through an MCCH dedicated SIB or MCCH.

Wherein, different service types can adopt the same modification period and the same transmission times, and each group of modification period and transmission times can correspond to a plurality of QCIs. Therefore, the QCI value of the service type corresponding to each of the M modification periods/transmission times may be broadcast through an MCCH-specific SIB or MCCH.

And S406, providing the modification period and the transmission times adopted by each broadcast service on the MCCH.

S407, introducing a coverage indication domain into a DCI format on a PDCCH scrambled by the MCCH-RNTI by the CRC.

It should be understood that the implementation principle and manner of S407 may refer to S207, and will not be described herein.

S408, in the 3gpp r17 NR protocol, the following functions are introduced: when 3GPP R17 UE receives a broadcast service, the UE reacquires the MCCH from the latest MCCH repetition period when the following condition 1 or condition 2 is satisfied until the coverage indication area in the TMGI of the broadcast service is provided on the MCCH captured by the UE or the DCI format on the PDCCH corresponding to the captured MCCH is 1. And when the TMGI of the broadcast service is provided on the MCCH captured by the UE, the UE continuously receives the broadcast service according to the configuration information of the broadcast service on the MCCH. When the coverage indication domain in the DCI format on the PDCCH corresponding to the MCCH captured by the UE is 1, the UE uses the captured configuration information of each broadcast service on the MCCH to cover the configuration information of each broadcast service stored before. If the newly stored configuration information does not contain the configuration information of the broadcast service, the UE determines that the broadcast service is ended, and stops receiving the broadcast service; if the newly stored configuration information contains the configuration information of the broadcast service, the UE continues to receive the broadcast service according to the newly stored configuration information of the broadcast service.

It should be understood that the implementation principle and manner of S408 may refer to S208, which is not described herein.

S409, for a UE supporting multiple modification periods, when the UE decodes the MCCH correctly, the UE determines each modification period corresponding to the current MCCH, and the configuration information of the broadcast service of each service type corresponding to the modification period is sent on the current MCCH, and the UE covers the configuration information of the broadcast service of each service type received before with the configuration information of the broadcast service of each service type on the current MCCH.

It should be understood that the implementation principle and manner of S409 may refer to S209, and will not be described herein.

As shown in fig. 5, the modification period T is carried on the MCCH transmitted in the first 2 MCCH transmission windows in the first MCCH modification period at the same time _m (1) Modification period T _m (2) And modification period T _m (3) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in the 1/2 th MCCH transmitting window, the UE uses the configuration information of each broadcasting service on the current MCCH to cover the modification period T stored before _m (1) Modification period T _m (2) And modification period T _m (3) For a pair ofConfiguration information of each broadcast service. Only the modification period T is carried on MCCH transmitted in the last 2 MCCH transmission windows in the first MCCH modification period _m (1) And modification period T _m (2) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in 3/4 th MCCH transmitting window, UE uses the configuration information of each broadcasting service on current MCCH to cover the modification period T saved before _m (1) And modification period T _m (2) Configuration information of each corresponding broadcasting service.

Only the modification period T is carried on MCCH transmitted in 4 MCCH transmitting windows in the second/four MCCH modification periods _m (1) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in the 1/2/3/4 th MCCH transmitting window, the UE uses the configuration information of each broadcasting service on the current MCCH to cover the modification period T saved before _m (1) Configuration information of each corresponding broadcasting service.

Carrying modification period T on MCCH (multipoint control channel) transmitted in 4 MCCH transmitting windows in third MCCH modification period _m (1) And modification period T _m (2) Corresponding configuration information of each broadcasting service, when UE correctly decodes MCCH in the 1/2/3/4 th MCCH transmitting window, the UE uses the configuration information of each broadcasting service on the current MCCH to cover the modification period T saved before _m (1) And modification period T _m (2) Configuration information of each corresponding broadcasting service.

The embodiment of the application also provides a gNB for realizing the sending method of the MCCH in the NR cell.

The embodiment of the application also provides a method for dividing the sending method of the MCCH in the NR cell by the following parts:

wherein, condition 1: when the DRX period is configured for the broadcast service, the UE does not monitor the PDCCH for scheduling the broadcast service in a plurality of continuous DRX periods.

The embodiment of the application also provides a UE, which is 3GPP R17 UE and is used for realizing the following method:

Or alternatively, the first and second heat exchangers may be,

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A method for transmitting an MCCH in an NR cell, comprising:

wherein T is _m And T _r In ms, c=t _m /T _r 。

2. The method of claim 1, wherein said configuring a modification period for each service type of broadcast service comprises:

wherein the mth modification period T _m (m) satisfies the following formula: t (T) _m (m)＝T _m X R (M), m=1, … …, M, R (M) is a positive integer, R (1) =1.

3. The method according to claim 1 or 2, characterized in that after said configuring modification period for the broadcast service of each service type, the method further comprises:

4. The method according to claim 1 or 2, characterized in that after said configuring modification period for the broadcast service of each service type, the method further comprises:

determining the sending position of the MCCH change notice;

The determining the sending position of the MCCH change notification includes:

5. The method according to claim 1 or 2, characterized in that after said configuring modification period for the broadcast service of each service type, the method further comprises:

6. The method according to claim 1 or 2, characterized in that the method further comprises:

7. The method of claim 1, wherein said configuring a modification period for each service type of broadcast service comprises:

8. The method according to claim 2 or 7, characterized in that R (m) satisfies the following formula: r (m) =2 ^a(m) A (m) is a non-negative integer, a (1) =1.

9. The method as claimed in claim 7, wherein after the modification period and the number of transmissions are configured for the broadcast service of each service type, the M modification periods configured for the broadcast service of each service type are broadcasted through the MCCH-specific SIB, comprising:

10. The method of claim 7, wherein after said configuring the modification period and the number of transmissions for each service type of broadcast service, the method further comprises:

11. The method of claim 7, wherein after said configuring the modification period and the number of transmissions for each service type of broadcast service, the method further comprises:

determining the sending position of the MCCH change notice;

the determining the sending position of the MCCH change notification includes:

for the adoption of T _m (m) and C (m) when at least one of the service types is newly added in the next modification period _m At least one of (m) and C (m) uses T during the next modification period _m When the configuration information of the broadcast services of (m) and C (m) is updated, the first C (m) MCCHs are re-used in the first MCCH modification period in the next modification periodAnd sending the MCCH change notification in the MCCH transmitting window in a complex period.

12. The method of claim 7, wherein after said configuring the modification period and the number of transmissions for each service type of broadcast service, the method further comprises:

13. The method of claim 7, wherein the method further comprises:

14. The method according to claim 1, wherein the method further comprises:

15. The method of claim 14, wherein the method further comprises:

16. The method according to claim 1, wherein the method further comprises:

17. A gNB, wherein the gNB is configured to implement a method for transmitting an MCCH in an NR cell according to any of claims 1-16.

18. A UE, characterized in that the UE is configured to implement the method for transmitting MCCH in an NR cell according to any of claims 1-14, 16.

19. A UE, characterized in that it is a 3gpp r17 UE, said UE being adapted to implement the method of claim 14 or 15.