CN113473384B - Method and device for sending SC-MCCH (Single Carrier-multipoint control channel) change notification in NR (non-reciprocal) cell - Google Patents

Method and device for sending SC-MCCH (Single Carrier-multipoint control channel) change notification in NR (non-reciprocal) cell Download PDF

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CN113473384B
CN113473384B CN202010244914.8A CN202010244914A CN113473384B CN 113473384 B CN113473384 B CN 113473384B CN 202010244914 A CN202010244914 A CN 202010244914A CN 113473384 B CN113473384 B CN 113473384B
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sending
modification period
base station
change notification
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CN113473384A (en
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魏立梅
袁乃华
陈迎
范晨
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Chengdu TD Tech Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention provides a method and equipment for sending an SC-MCCH (Single Carrier-multipoint control channel) change notice in an NR (non-reciprocal) cell. The method comprises the following steps: a base station determines whether the SC-MCCH meets the condition of sending an SC-MCCH change notification in the next modification period or the next modification period in the current modification period of sending the SC-MCCH; if the base station determines that the SC-MCCH meets the condition of sending the SC-MCCH change notification in the next modification period or the next modification period within the current modification period; and the base station sends the SC-MCCH change notification in the next modification period. The UE can realize the instant downloading and saving of the MBMS configuration information under the 5G system, thereby realizing the receiving of the MBMS according to the latest saved MBMS configuration information when the MBMS is required to be received.

Description

Method and device for sending SC-MCCH (Single Carrier-multipoint control channel) change notification in NR (non-reciprocal) cell
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for sending an SC-MCCH change notification in an NR cell.
Background
In an LTE (Long Term Evolution) system defined by a 3GPP protocol, a Single-Cell Multicast control channel SC-MCCH is configured in a Cell, and the SC-MCCH carries SC-PTM (Single-Cell Point-to-multipoint) configuration information, where the SC-PTM configuration information is a set of configuration information of each MBMS (Multimedia Broadcast Multicast Service) broadcasted in an SC-PTM manner in a current Cell. The UE can capture SC-PTM configuration information of the current cell by receiving the SC-MCCH, and can receive data of corresponding MBMS according to the configuration information of each MBMS. When there is a new MBMS broadcast in SC-PTM mode in the cell, the SC-PTM configuration information is updated to include the configuration information of the new MBMS. The base station sends an SC-MCCH change notice in the cell and sends updated SC-PTM configuration information through the SC-MCCH. And after receiving the SC-MCCH change notification, the UE receives the SC-MCCH again to acquire the latest SC-PTM configuration information. In this way, when a cell broadcasts a new MBMS, the UE does not miss the start time of the new MBMS.
With the widespread use of the LTE system, the era of wireless internet has been opened. Wireless internet has developed more diverse demands for wireless networks, including not only higher system throughput, but also lower transmission delay, higher reliability, and a greater number of connected users. To meet these requirements, a fifth generation mobile communication system (referred to as a 5G system for short) has come, a base station of the 5G system is called a gNB, and a cell controlled by the gNB is an NR (New Radio access) cell. When NR cell sends MBMS in SC-PTM mode, gNB still carries SC-PTM configuration information in SC-MCCH. In NR cells, in which scenarios to send SC-MCCH change notifications and how to send SC-MCCH change notifications, no corresponding processing method is currently proposed.
Disclosure of Invention
The invention provides a method and equipment for sending an SC-MCCH (Single Carrier-multipoint control channel) modification notice in an NR (non-reciprocal) cell, which are used for sending the SC-MCCH modification notice in a 5G system.
In a first aspect, the present invention provides a sending method for an SC-MCCH change notification of an NR cell, which is applied to a base station in a 5G system, where a cell controlled by the base station is a new wireless NR cell, and the method includes:
for any single-cell multicast control channel SC-MCCH in a current NR cell, a base station determines whether the SC-MCCH meets the condition of sending an SC-MCCH change notification in the next modification period or the next modification period in the current modification period of sending the SC-MCCH;
if the base station determines that the SC-MCCH meets the condition of sending the SC-MCCH change notification in the next modification period in the current modification period;
and the base station sends the SC-MCCH change notification in the next modification period.
Optionally, the condition for sending the SC-MCCH change notification is: and the SC-MCCH is provided with newly added MBMS configuration information.
Optionally, the condition for sending the SC-MCCH change notification is: the SC-MCCH is provided with newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes.
Optionally, the sending, by the base station, the SC-MCCH change notification in the next modification period includes:
and the base station respectively adopts K wave beams to send the SC-MCCH change notification from an initial position to K continuous occasions within each repetition period in the next modification period on the BWP where the SC-MCCH is located. The K is the number of beams adopted when the synchronization signal/physical broadcast channel SS/PBCH block is transmitted in the current NR cell, and the K beams are the K beams adopted when the SS/PBCH block is transmitted in the current NR cell.
Optionally, the starting position is the same as the starting position where the base station sends configuration information through the SC-MCCH in the repetition period.
Optionally, the starting position is the same as the starting position of the PDCCH carrying the SC-MCCH scheduling information sent by the base station in the repetition period.
Optionally, before the base station determines, in the current modification period for sending the SC-MCCH, whether the SC-MCCH satisfies a condition for sending an SC-MCCH modification notification in a next modification period or in another next modification period, the method further includes:
and determining the configuration information carried on the SC-MCCH.
Optionally, the determining the configuration information carried on the SC-MCCH includes:
the base station divides all bandwidth fragments BWP carrying MBMS broadcast in an SC-PTM mode in the NR cell into one or more groups, and each group at least comprises one BWP;
the base station configures an SC-MCCH for BWP included in each group;
and determining the configuration information carried on the corresponding SC-MCCH according to the BWP included in each group.
Optionally, the sending, by the base station, the SC-MCCH change notification by respectively using K beams from a starting position to occupy K consecutive occasions on a BWP where the SC-MCCH is located in each repetition period in the next modification period includes:
the base station adopts K wave beams to respectively transmit a Cyclic Redundancy Check (CRC) and a single cell to inform a radio network temporary identifier (SC-N-RNTI) scrambled PDCCH by using K wave beams from an initial position to occupy continuous K occasions on BWP where the SC-MCCH is located in each repetition period in the next modification period; the DCI format on the PDCCH comprises a change notification domain and an MBMS configuration update domain, wherein when the bit included in the change notification domain is a preset value, the change notification domain indicates that the SC-MCCH has newly added MBMS configuration information, and when the bit included in the MBMS configuration update domain is a preset value, the change notification domain indicates that the existing MBMS configuration information on the SC-MCCH has been sent.
In a second aspect, the present invention provides an apparatus for sending an SC-MCCH change notification in an NR cell, including: a determining module and a sending module;
for any single-cell multicast control channel SC-MCCH in the current NR cell, the determining module is used for determining whether the SC-MCCH meets the condition of sending an SC-MCCH change notification in the next modification period or the next modification period in the current modification period of sending the SC-MCCH;
the sending module is configured to send the SC-MCCH modification notification in the next modification period when the determining module determines that the SC-MCCH satisfies the condition for sending the SC-MCCH modification notification in the next modification period or in the next modification period within the current modification period.
Optionally, the condition for sending the SC-MCCH change notification is: and the SC-MCCH is provided with newly added MBMS configuration information.
Optionally, the condition for sending the SC-MCCH change notification is: the SC-MCCH is provided with newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes.
Optionally, the sending module is specifically configured to:
and in each repetition period in the next modification period, on the BWP where the SC-MCCH is located, respectively adopting K beams to send the SC-MCCH change notification by occupying continuous K occasions from the initial position. The K is the number of beams adopted when the synchronization signal/physical broadcast channel SS/PBCH block is transmitted in the current NR cell, and the K beams are the K beams adopted when the SS/PBCH block is transmitted in the current NR cell.
Optionally, the starting position is the same as the starting position where the base station sends configuration information through the SC-MCCH in the repetition period.
Optionally, the starting position is the same as the starting position of the PDCCH carrying the SC-MCCH scheduling information sent by the base station in the repetition period.
Optionally, the determining module is further configured to:
and determining the configuration information carried on the SC-MCCH.
Optionally, the determining module is specifically configured to:
dividing all bandwidth fragments BWP carrying MBMS broadcast in an SC-PTM mode in the NR cell into one or more groups, wherein each group at least comprises one BWP;
the base station configures an SC-MCCH for BWP included in each group;
and determining the configuration information carried on the corresponding SC-MCCH according to the BWP included in each group.
Optionally, the sending module is specifically configured to:
in each repetition period in the next modification period, on the BWP where the SC-MCCH is located, starting to occupy continuous K occasions from the initial position, and respectively adopting K wave beams to send a single cell for sending Cyclic Redundancy Check (CRC) to inform a radio network temporary identifier (SC-N-RNTI) scrambled PDCCH; the DCI format on the PDCCH comprises a change notification domain and an MBMS configuration update domain, wherein when the bit included in the change notification domain is a preset value, the change notification domain indicates that the SC-MCCH has newly added MBMS configuration information, and when the bit included in the MBMS configuration update domain is a preset value, the change notification domain indicates that the existing MBMS configuration information on the SC-MCCH has been sent.
In a third aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method for transmitting an SC-MCCH change notification for an NR cell.
In a fourth aspect, the present invention provides a base station, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to implement the sending method of the SC-MCCH modification notification of the NR cell via execution of the executable instructions.
In a fifth aspect, the present invention provides a communication system, including the above base station and UE.
The method and the device for sending the SC-MCCH modification notification of the NR cell are suitable for a 5G system, and a base station determines whether the SC-MCCH meets the condition for sending the SC-MCCH modification notification in the next modification period or the next modification period in the current modification period for sending the SC-MCCH for any single-cell multicast control channel SC-MCCH in the current NR cell; if the base station determines that the SC-MCCH meets the condition of sending the SC-MCCH change notification in the next modification period or the next modification period within the current modification period; and the base station sends the SC-MCCH change notification in the next modification period. The UE can realize the instant downloading and saving of the MBMS configuration information under the 5G system, thereby realizing the receiving of the MBMS according to the latest saved MBMS configuration information when the MBMS is required to be received.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1a is a diagram of a 5G system architecture provided by the present invention;
fig. 1b is a schematic diagram of an NR cell in a 5G system according to the present invention;
fig. 2a is a schematic flowchart of a first embodiment of a method for processing service configuration information according to the present invention;
FIG. 2b is a schematic diagram of a modification period and a repetition period provided by the present invention;
fig. 3 is a flowchart illustrating a second embodiment of a method for processing service configuration information according to the present invention;
fig. 4 is a schematic structural diagram of a first embodiment of a device for sending a service configuration information change notification provided by the present invention;
fig. 5 is a schematic diagram of a hardware structure of a base station according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an LTE system, only one SC-MCCH is configured in a cell, when a new MBMS broadcast in an SC-PTM mode exists, a base station can send an SC-MCCH change notification, and after receiving the notification, UE can receive the SC-MCCH again to obtain the latest SC-PTM configuration information borne by the SC-MCCH so as to ensure that the UE cannot miss receiving the new MBMS. However, for the 5G system, no corresponding sending method for the SC-MCCH change notification is proposed at present.
Fig. 1a is an architecture diagram of a Next-generation Radio Access Network (NG-RAN for short) in a 5G system, and fig. 1b is a schematic diagram of an NR cell in the 5G system. In fig. 1, a gNB is a base station of a 5G system, a cell controlled by the gNB is an NR cell, an ng-eNB is an LTE-enhanced base station accessing a 5G core network, and a cell controlled by the ng-eNB is an LTE cell. The gNB and the NG-eNB are respectively connected with the 5GC through NG interfaces, the gNB is interconnected through an Xn interface, the gNB is connected with the NG-eNB through an Xn interface, and the NG-eNB is interconnected through an Xn interface.
On the premise that how to send the SC-MCCH change notification in the NR cell in the 5G system has not been proposed in the prior art, the present invention proposes a sending method for the SC-MCCH change notification applicable to the NR cell in the 5G system, and fig. 2a is a flowchart of an embodiment one of the sending method for the SC-MCCH change notification in the NR cell provided by the present invention. The sending method of the SC-MCCH change notification provided in this embodiment may be applied to the base station gNB of the 5G system shown in fig. 1. As shown in fig. 2a, the sending method for SC-MCCH modification notification provided in this embodiment includes:
s200, setting the condition for sending the SC-MCCH change notification in an NR cell defined by a 3GPP protocol.
Specifically, the condition for transmitting the SC-MCCH change notification may be one of the following conditions:
condition 1: and when the SC-MCCH has the configuration information of the newly added MBMS, sending a SC-MCCH change notification.
Condition 2: and when the SC-MCCH has newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes, sending an SC-MCCH change notification.
When the above condition 1 is adopted in the NG-RAN, the SC-MCCH change notification is transmitted only when there is configuration information of a newly added MBMS on the SC-MCCH. When the above condition 2 is adopted in the NG-RAN, the SC-MCCH change notification is transmitted when there is configuration information of a newly added MBMS on the SC-MCCH, and the SC-MCCH change notification is also transmitted when there is a change in the configuration information of the existing MBMS on the SC-MCCH.
Obviously, the scenario for transmitting the SC-MCCH change notification corresponding to the above condition 2 covers the scenario for transmitting the SC-MCCH change notification corresponding to the above condition 1.
Selecting one condition from the two conditions, and determining a scene for sending the SC-MCCH change notification in an NR cell defined by a 3GPP protocol according to the selected condition.
S201, in a current NR cell, for any SC-MCCH, a base station determines whether the SC-MCCH meets the condition of sending an SC-MCCH change notification in the next modification period in each modification period of sending the SC-MCCH. If the base station determines that the SC-MCCH meets the condition of sending the SC-MCCH change notification in the next modification period in the current modification period, the base station executes S202 or S203, and the S202 and the S203 respectively correspond to a method for determining the sending time of the SC-MCCH change notification.
Specifically, for any one SC-MCCH, the base station determines the configuration information carried thereon according to the following method.
The first step is as follows: the base station divides BWP carrying MBMS broadcast in SC-PTM mode in a cell into several groups, each group includes at least one BWP.
The second step is that: and the base station configures an SC-MCCH for each group of BWPs.
The third step: the base station determines the configuration information carried on each SC-MCCH. The method comprises the following specific steps:
for a group that includes only one BWP, the SC-MCCH configured for the group by the base station becomes the SC-MCCH configured for the BWP. The SC-MCCH is transmitted on the BWP. The SC-MCCH carries at least SC-PTM configuration information of the BWP, namely: the SC-MCCH can also carry SC-PTM configuration information of other BWPs besides the SC-PTM configuration information of the BWP.
For a group including more than one BWP, the base station specifies one BWP among the BWPs included in the group for transmitting the SC-MCCH configured for the group. The SC-MCCH carries at least SC-PTM configuration information for each BWP included in the group, namely: the SC-MCCH may carry SC-PTM configuration information of BWPs not belonging to the group in addition to SC-PTM configuration information of BWPs included in the group.
The SC-PTM configuration information of one BWP is a set of configuration information of MBMS broadcast in an SC-PTM mode on the BWP.
After determining the configuration information carried on each SC-MCCH according to the above method, it may be determined whether an SC-MCCH satisfies the condition for sending an SC-MCCH change notification according to the condition set in S200. The method comprises the following specific steps:
for each SC-MCCH, SC-PTM configuration information is determined which BWPs are carried on it, and these BWPs are grouped into a SET-BWP, for which SC-MCCH condition 1 and condition 2 in step S200 become:
condition 1: and when any BWP in the SET SET-BWP has a newly added MBMS, sending an SC-MCCH change notification.
Condition 2: and when the configuration information of the newly added MBMS on any BWP in the SET SET-BWP or the existing MBMS on any BWP in the SET SET-BWP changes, sending an SC-MCCH change notice.
S202, for any SC-MCCH which meets the condition of sending the SC-MCCH modification notice, on a BWP where the SC-MCCH is located, a base station uses K beams to send the SC-MCCH modification notice respectively at K continuous opportunities occupied from a starting position in each repetition period in the next modification period of sending the SC-MCCH. In the next modification period of sending the SC-MCCH, the starting position in each repetition period is the same as the starting position of the base station sending the configuration information on the base station through the SC-MCCH in the repetition period.
The K is the number of beams adopted when the synchronization signal/physical broadcast channel SS/PBCH block is transmitted in the current NR cell, and the K beams are the K beams adopted when the SS/PBCH block is transmitted in the current NR cell.
The following first describes a broadcast method of SC-MCCH in an NR cell.
Specifically, when the base station configures the SC-MCCH for one NR cell, each SC-MCCH is separately configured with a modification period a, a Subcarrier Spacing (SCs for short) parameter u of the BWP where the repetition period B, SC-MCCH is located, a continuous time number Duration occupied by the SC-MCCH, a parameter C, and other parameters.
For any SC-MCCH, the modification period with the length of A radio frames comprises A/B repetition periods, and each repetition period has the length of B radio frames. And the SC-MCCH is repeatedly transmitted in each repetition period in a modification period, the content of each repeated transmission is the same, the initial position of each repeated transmission of the SC-MCCH is determined by u and a parameter C, and the SC-MCCH occupies continuous time for transmission from the initial position of each repeated transmission of the SC-MCCH.
Specifically, as shown in fig. 2b, the base station sends the configuration information on the base station through the SC-MCCH in units of modification periods, where each modification period includes multiple repetition periods.
The base station determines the subscript SFN of the initial radio frame of each modification period according to the following formula:
SFN MOD a is 0, where the modulus of SFN and a is 0.
The base station determines a starting position for transmitting the SC-MCCH in each repetition period in one modification period in one of the following manners. The starting position for transmitting the SC-MCCH in each repetition period in a modification period may be selected in a 3GPP protocol-defined NR cell in a selected manner.
The first method is as follows: each time slot in a modification period is numbered in sequence from 0, the subscript of the time slot of the initial position for sending the SC-MCCH for the first time in the modification period is offset timeslot (unit: time slot), and the subscript of the time slot corresponding to the initial position for repeatedly sending the SC-MCCH each time in the modification period is as follows:
Figure BDA0002433743520000091
in the above formula, the first and second carbon atoms are,
OffsetTimeslot<B*10*2 u ，OffsetTimeslot+K*m-1<B*10*2 u 。
and starting from the time slot with the subscript T (b) in each modification period according to the formula, the SC-MCCH occupies continuous Duration time for transmission, and the SC-MCCH bears corresponding configuration information.
The second method comprises the following steps: the offset of the starting radio frame for transmitting the SC-MCCH in each repetition period is denoted by offsetradio frame, and the index SFN1 of the starting radio frame for transmitting the SC-MCCH in each repetition period is determined by the following equation:
SFN1 MOD B＝OffsetRadioframe
in a starting radio frame SFN1 for transmitting the SC-MCCH, the subscript of the first time slot for transmitting the SC-MCCH is represented by FirstTimeslot, and the SCCH occupies Duration time to transmit the configuration information thereof from the time slot with the subscript of the FirstTimeslot in a radio frame SFN 1.
The values of the Duration are as follows: k, K × 2, …, K × M, …, K × M, K is the number of beams used by the SS/PBCH Block in the NR cell. And M is the maximum segmentation number adopted by the configuration information on the SC-MCCH during transmission.
When the initial position of each repeated sending of the SC-MCCH is determined by adopting the first mode, the parameter C is offset timeslot; and when the initial position of each repeated transmission of the SC-MCCH is determined by adopting the second mode, the parameter C is the offsetRadioframe. When the second method is adopted, the parameters individually configured for each SC-MCCH by the base station further include: a FirstTimeslot, which is used to indicate a subscript of a starting timeslot for starting transmitting the SC-MCCH in a starting radio frame for transmitting the SC-MCCH.
For each SC-MCCH, when the base station determines that the SC-MCCH satisfies the condition for sending the modification notification, and sends the SC-MCCH modification notification on the BWP where the SC-MCCH is located, the start position of the configuration information sent by the SC-MCCH in each repetition period on the BWP where the SC-MCCH is located may be used as the start position, and K beams may be respectively used to send the SC-MCCH modification notification on the corresponding BWP at K consecutive occasions from the start position of each repetition period. Here, the K beams are K beams used for transmission of a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH Block for short) in the NR cell.
S203, for any SC-MCCH meeting the condition of sending the SC-MCCH modification notice, on the BWP where the SC-MCCH is located, the base station uses K wave beams to send the SC-MCCH modification notice respectively at K continuous time intervals from the initial position in each repetition period in the next modification period of sending the SC-MCCH. In the next modification period for transmitting the SC-MCCH, the starting position in each repetition period is the same as the starting position of the PDCCH carrying the SC-MCCH scheduling information, which is transmitted by the base station in the repetition period.
Specifically, in each repetition period, the timing relation K between the PDCCH and the PDSCH is satisfied between the starting position of the PDCCH for carrying the SC-MCCH scheduling information and the starting position of the SC-MCCH for carrying the configuration information 0 . The SCS parameters corresponding to the PDCCH and the PDSCH carrying the SC-MCCH are respectively set as follows: mu.s PDsCH And mu PDCCH The relationship between the starting position of PDCCH being n (b) and the starting position of PDSCH being t (b) is as follows:
Figure BDA0002433743520000101
according to the formula, the SC-MCCH change notification is reversely deduced from T (b) to n (b), and K wave beams can be respectively adopted to transmit the SC-MCCH change notification at the continuous K occasions from n (b) in each repetition period.
Alternatively, the SC-MCCH change notification may be transmitted only during the first few repetition periods of the next modification period, and need not be transmitted every repetition period during the next modification period.
Optionally, the SC-MCCH change notification may be sent one modification period in advance, that is: step S201 is modified as follows:
s201, in a current NR cell, if a base station determines, for any SC-MCCH, in a current modification period of the SC-MCCH (subscript of the current modification period is 0), that a modification period of the SC-MCCH with subscript P (P ═ 2) satisfies a condition for sending an SC-MCCH modification notification, the base station executes S202 or S203, and the S202 and S203 respectively correspond to a method for determining a sending timing of the SC-MCCH modification notification.
In step S201 of the above modification, a subscript 0 indicates a current modification period of the SC-MCCH, and the modification periods following the current modification period are numbered sequentially from 1, where the modification period with the subscript P ═ 2 is one modification period apart from the current modification period. And the base station sends an SC-MCCH modification notice in the next modification period of the current modification period, the contents of the configuration information on the SC-MCCH in the current modification period and the next modification period are the same, and the SC-MCCH sends new configuration information in the modification period with the subscript of P-2.
According to the step S201 of modification, for any SC-MCCH in the NR cell, if the base station determines that the modification period with the subscript P ═ 2 in the current modification period (subscript of the current modification period is 0) in which the SC-MCCH is transmitted satisfies the condition for transmitting the SC-MCCH modification notification, the base station transmits the SC-MCCH modification notification in the next modification period (modification period with subscript 1), and may determine the starting position for transmitting the SC-MCCH modification notification according to the above S202 or S203 in each repetition period in the next modification period.
Optionally, the SC-MCCH change notification may also be sent in N consecutive repetition periods starting from the (N + 1) th repetition period in the next modification period. The starting location for transmitting the SC-MCCH change notification in each repetition period may be determined according to the method in S202 or S203 described above. When N > a/B-N, the consecutive N repetition periods consist of the last (a/B-N) modification period in the next modification period and the first N- (a/B-N) repetition periods in the modification period with the index P ═ 2. In the method, the SC-MCCH change notification is transmitted at N consecutive repetition periods.
To save PDCCH, N may be made 1 or N < a/B.
The sending method of the SC-MCCH change notification provided in this embodiment introduces the timing for sending the SC-MCCH change notification in the 5G system, so that the UE can receive the change notification in the timing for sending the change notification in the 5G system.
To further illustrate the presentation form of the SC-MCCH change notification, the present invention provides a second embodiment of a sending method of the SC-MCCH change notification, and fig. 3 is a flowchart illustrating the second embodiment of the sending method of the SC-MCCH change notification in the NR cell provided by the present invention. As shown in fig. 3, the SC-MCCH change notification sending method provided in this embodiment includes:
s300, setting the condition for sending the SC-MCCH change notification in the NR cell defined by the 3GPP protocol.
S301, in the current NR cell, for any SC-MCCH, the base station determines whether the SC-MCCH meets the condition of sending the SC-MCCH change notification in each modification period of sending the SC-MCCH. If the base station determines that the SC-MCCH satisfies the condition for sending the SC-MCCH change notification in the current modification period, the base station performs S302. The base station determines whether the SC-MCCH meets the condition of sending the SC-MCCH change notification as follows:
and the base station determines whether the SC-MCCH meets the condition of sending the SC-MCCH change notification in the next modification period. Or
The base station determines whether the modification period of the SC-MCCH with subscript P-2 meets the condition of sending the SC-MCCH change notification. And the subscript of the current modification period of the SC-MCCH is 0, the modification periods after the current modification period are numbered in sequence, and the modification period with the subscript of P2 is the next modification period of the next modification period.
S302, for any SC-MCCH meeting the condition of sending the SC-MCCH modification notice, on the BWP where the SC-MCCH is located, a base station adopts K wave beams to send Cyclic Redundancy Check (CRC) respectively at K continuous occasions from the initial position in each repetition period from the next modification period of sending the SC-MCCH, and informs a radio network temporary identity (Single Cell Notification RNTI, SC-N-RNTI for short) of a scrambled PDCCH by using a Single Cell. And in each time machine, the base station allocates CCE resources to the PDCCH in the search space corresponding to the PDCCH on the control resource set corresponding to the PDCCH, and the PDCCH adopts the allocated CCE resources and the allocated beams to transmit at the corresponding time. The starting position for sending the SC-MCCH change notification in each repetition period is as follows: the starting location of the SC-MCCH transmitted in the repetition period (see step S202) or the starting location of the PDCCH transmitting the scheduling information of the SC-MCCH in the repetition period (see step S203). Preferably, for any SC-MCCH, the same control resource set and search space are configured for the PDCCH carrying the CRC of the SC-MCCH change notification scrambled by the SC-N-RNTI and the PDCCH carrying the CRC of the SC-MCCH scheduling information scrambled by the SC-RNTI on the BWP where the SC-MCCH is located. And the modification notification of the SC-MCCH and the scheduling information of the SC-MCCH are sent in the same search space on the same control resource set on the BWP sending the SC-MCCH.
And the SC-MCCH change notification domain in the DCI format on the PDCCH is used for sending the SC-MCCH change notification, and K is a positive integer and is the number of beams adopted by the SS/PBCH block of the current cell.
The SC-MCCH change notification domain comprises 1 bit, and when the bit value is 1, the SC-MCCH change notification domain indicates that the corresponding SC-MCCH has newly added MBMS configuration information;
in step S300, the condition for transmitting the SC-MCCH change notification set in the NR cell defined by the 3GPP protocol is one of the conditions.
Condition 1: and when the SC-MCCH has the configuration information of the newly added MBMS, sending an SC-MCCH change notice.
Condition 2: and when the SC-MCCH has newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes, sending an SC-MCCH change notification.
When condition 1 is adopted, the following fields may also be included in the DCI format on the PDCCH with the CRC scrambled with the SC-N-RNTI:
(1) and the MBMS configuration updating domain comprises a bit, and when the bit is 1, the MBMS configuration updating domain indicates that the configuration information of the existing MBMS on the SC-MCCH is changed.
(2) QCI (QoS Class ID, quality of service Class identification) field.
And the base station refers to the QCI of each MBMS in the configuration information carried by the SC-MCCH and records all different QCI values, wherein the QCI domain is represented by L bits, and each bit corresponds to a different QCI value. And when the corresponding bit is 1, indicating that the QCI on the SC-MCCH is the configuration information of the MBMS of the QCI corresponding to the bit, and changing the configuration information. Such as: when the MBMS is a voice service, the QCI is 1, and is indicated by a bit with an index of 0 among the L bits. When the subscript is 0 and the bit is 1, indicating that the configuration information of at least one voice service in each MBMS included in the configuration information on the SC-MCCH is changed.
When condition 1 is adopted, the MBMS configuration update field and the QCI field may be optionally included in a DCI format on a PDCCH where CRC is scrambled with SC-N-RNTI.
When condition 2 is adopted, at least the MBMS configuration update field, and optionally the QCI field, is included in the DCI format on the PDCCH scrambled with the SC-N-RNTI for the CRC.
For any SC-MCCH, when the SC-MCCH meets the condition of sending an SC-MCCH change notification, one or more of the following domains can be further included in the DCI format on the PDCCH scrambled by the SC-N-RNTI for the CRC:
(1) and other SC-MCCH change notification fields, wherein the number of bits included in the other SC-MCCH change notification fields is equal to Num-1, and Num is the number of SC-MCCHs in the cell. Each bit of the domain corresponds to a different SC-MCCH in the other SC-MCCHs, and when the corresponding bit is 1, the configuration information of the newly added MBMS on the corresponding SC-MCCH is indicated.
(2) MBMS configuration update field of other SC-MCCH, which includes the number of bits equal to Num-1. Each bit of the domain corresponds to a different SC-MCCH in other SC-MCCHs, and when the corresponding bit is 1, the corresponding bit indicates that the configuration information of the existing MBMS on the corresponding SC-MCCH is changed.
(3) QCI domain of other SC-MCCH: each other SC-MCCH has a QCI field, and the QCI field of each other SC-MCCH is defined as above. In order to distinguish the SC-MCCH change notification in an air interface, an RNTI is distributed to the SC-MCCH change notification and is expressed by the SC-N-RNTI. When one NR cell has more than one SC-MCCH, different SC-MCCHs are located on different BWPs, and there are no two SC-MCCHs on the same BWP, and the modification notification of each SC-MCCH is sent on the BWP that sends each SC-MCCH, respectively, so no confusion occurs. Preferably, a fixed RNTI is allocated to the SC-MCCH change notification, that is: the SC-N-RNTI is a fixed value in the NR cell defined by the 3GPP protocol. And then, when one SC-MCCH meets the condition of sending the SC-MCCH modification notice, respectively adopting K beams to send the PDCCH scrambled by the SC-N-RNTI for CRC on the BWP on which the SC-MCCH is positioned and occupying continuous K occasions from the initial position in each repetition period in the corresponding modification period. The PDCCH adopts the allocated CCE resources and the allocated beams when being transmitted at each opportunity.
For each SC-MCCH, the UE may monitor a PDCCH scrambled with an SC-N-RNTI for a CRC on a Common Search Space (CSS) mapped to a corresponding Control Resource Set (Control Resource Set, referred to as CORESET) on a BWP where the SC-MCCH is located to capture a DCI format on the PDCCH, and then check an SC-MCCH change notification field in the DCI format on the PDCCH to determine whether there is configuration information of a newly added MBMS on the SC-MCCH. And corresponding other information can be determined according to other domains in the DCI format on the PDCCH.
The SC-MCCH change notification transmission method in an NR cell provided in this embodiment describes a presentation form of an SC-MCCH change notification of any SC-MCCH, and a UE can know whether there is configuration information of a newly added MBMS on a corresponding SC-MCCH through a value of a corresponding bit in the presentation form. When the corresponding SC-MCCH has the configuration information of the newly added MBMS, the UE can download the new configuration information on the corresponding SC-MCCH in time to obtain the configuration information of the newly added MBMS so as not to miss the receiving of the new MBMS. Of course, other fields may also be carried in the corresponding DCI format to provide other relevant information to the UE while transmitting the SC-MCCH change notification.
Fig. 4 is a schematic structural diagram of a SC-MCCH change notification transmitting apparatus in an NR cell according to a first embodiment of the present invention. As shown in fig. 4, the apparatus for transmitting an MBMS change notification according to this embodiment includes: a determination module 401 and a sending module 402.
For any single-cell multicast control channel SC-MCCH in a current NR cell, the determining module 401 is configured to determine, in a current modification period for transmitting the SC-MCCH, whether the SC-MCCH satisfies a condition for transmitting an SC-MCCH modification notification in a next modification period or in a next modification period, where the condition for transmitting the SC-MCCH modification notification is one of the following conditions:
condition 1: the SC-MCCH is provided with newly added MBMS configuration information;
condition 2: the SC-MCCH is provided with newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes;
explicit in NR cells defined by 3GPP protocols: which condition is used at all.
The sending module 402 is configured to send the SC-MCCH modification notification in the next modification period when the determining module 401 determines that the SC-MCCH satisfies the condition for sending the SC-MCCH modification notification in the next modification period or in another next modification period in the current modification period.
Optionally, the sending module 402 is specifically configured to:
and the base station respectively adopts K wave beams to send the SC-MCCH change notification from an initial position to K continuous occasions within each repetition period in the next modification period on the BWP where the SC-MCCH is located.
Optionally, the starting position is the same as the starting position where the base station sends configuration information through the SC-MCCH in the repetition period.
Optionally, the starting position is the same as the starting position of the PDCCH carrying the SC-MCCH scheduling information sent by the base station in the repetition period.
Optionally, the determining module 401 is further configured to determine, before determining, in the current modification period for sending the SC-MCCH, whether the SC-MCCH satisfies a condition for sending an SC-MCCH modification notification in a next modification period or in a next modification period, configuration information carried on the SC-MCCH.
Optionally, the determining module 401 is specifically configured to:
the base station divides all bandwidth fragments BWP carrying MBMS broadcast in an SC-PTM mode in the NR cell into one or more groups, and each group at least comprises one BWP;
the base station configures an SC-MCCH for BWP included in each group;
and determining the configuration information carried on the corresponding SC-MCCH according to the BWP included in each group.
Optionally, the sending module 402 is specifically configured to:
in each repetition period in the next modification period, on the BWP where the SC-MCCH is located, starting to occupy continuous K occasions from the initial position, and respectively adopting K wave beams to send a single cell for sending Cyclic Redundancy Check (CRC) to inform a radio network temporary identifier (SC-N-RNTI) scrambled PDCCH; the DCI format on the PDCCH comprises a change notification domain and an MBMS configuration update domain, wherein when the bit included in the change notification domain is a preset value, the change notification domain indicates that the SC-MCCH has newly added MBMS configuration information, and when the bit included in the MBMS configuration update domain is a preset value, the change notification domain indicates that the existing MBMS configuration information on the SC-MCCH has been sent.
The SC-MCCH change notification sending apparatus in an NR cell provided in this embodiment may be configured to perform the steps in any of the above method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 5 is a schematic diagram of a hardware structure of a base station according to the present invention. As shown in fig. 5, the base station of this embodiment may include:
a memory 501 for storing program instructions.
The processor 502 is configured to implement the service configuration information processing method described in any of the above embodiments when the program instruction is executed, and specific implementation principles may refer to the above embodiments, which are not described herein again.
The invention provides a communication system which comprises the base station and UE.
The present invention provides a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the service configuration information processing method described in any of the above embodiments.
The present invention also provides a program product, which includes a computer program stored in a readable storage medium, from which the computer program can be read by at least one processor, and the at least one processor executes the computer program to enable a base station to implement the service configuration information processing method described in any of the above embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes.
It should be understood that the Processor described herein may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules in the processor.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. A sending method of SC-MCCH change notification in an NR cell is applied to a base station in a 5G system, and a cell controlled by the base station is a new wireless NR cell, and is characterized by comprising the following steps:
for any single-cell multicast control channel SC-MCCH in a current NR cell, a base station determines whether the SC-MCCH meets the condition of sending an SC-MCCH change notification in the next modification period or the next modification period in the current modification period of sending the SC-MCCH;
if the base station determines that the SC-MCCH meets the condition of sending the SC-MCCH change notification in the next modification period or the next modification period within the current modification period;
the base station sends the SC-MCCH change notification in the next modification period.
2. The method of claim 1, wherein the sending the SC-MCCH modification notification is conditioned on: the SC-MCCH is provided with newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes.
3. The method of claim 1, wherein the base station then sends the SC-MCCH modification notification in the next modification period, comprising:
and the base station respectively adopts K wave beams to send the SC-MCCH change notice on the BWP where the SC-MCCH is located in each repetition period in the next modification period from the starting position to occupy continuous K occasions, wherein K is the number of the wave beams adopted when a synchronous signal/physical broadcast channel SS/PBCH block is sent in the current NR cell, and K wave beams are the K wave beams adopted when the SS/PBCH block is sent in the current NR cell.
4. The method of claim 3, wherein the starting position is the same as a starting position at which the base station sends configuration information through the SC-MCCH within the repetition period.
5. The method of claim 3, wherein the starting position is the same as a starting position where the base station sends a PDCCH carrying the SC-MCCH scheduling information within the repetition period.
6. The method of any one of claims 1-3, wherein before the base station determines whether the SC-MCCH satisfies a condition for sending an SC-MCCH modification notification in a next modification period or a next modification period in a current modification period for sending the SC-MCCH, the method further comprises:
and determining the configuration information carried on the SC-MCCH.
7. The method of claim 4, wherein the determining the configuration information carried on the SC-MCCH comprises:
the base station divides all bandwidth fragments BWP carrying MBMS broadcast in an SC-PTM mode in the NR cell into one or more groups, and each group at least comprises one BWP;
the base station configures an SC-MCCH for BWP included in each group;
and determining the configuration information carried on the corresponding SC-MCCH according to the BWP included in each group.
8. The method of claim 2 or 3, wherein the base station transmits the SC-MCCH modification notification by using K beams respectively for K occasions from a starting position on a BWP where the SC-MCCH is located in each repetition period in the next modification period, and the method comprises:
the base station adopts K wave beams to respectively transmit a Cyclic Redundancy Check (CRC) and a single cell to inform a radio network temporary identifier (SC-N-RNTI) scrambled PDCCH by using K wave beams from an initial position to occupy continuous K occasions on BWP where the SC-MCCH is located in each repetition period in the next modification period; the DCI format on the PDCCH comprises a change notification domain and an MBMS configuration update domain, wherein when the bit included in the change notification domain is a preset value, the change notification domain indicates that the SC-MCCH has newly added MBMS configuration information, and when the bit included in the MBMS configuration update domain is a preset value, the change notification domain indicates that the existing MBMS configuration information on the SC-MCCH has been sent.
9. An apparatus for transmitting an SC-MCCH change notification in an NR cell, comprising: a determining module and a sending module;
for any single-cell multicast control channel SC-MCCH in the current NR cell, the determining module is used for determining whether the SC-MCCH meets the condition of sending an SC-MCCH change notification in the next modification period or the next modification period in the current modification period of sending the SC-MCCH;
the sending module is configured to send the SC-MCCH modification notification in the next modification period when the determining module determines that the SC-MCCH satisfies the condition for sending the SC-MCCH modification notification in the next modification period or in the next modification period within the current modification period.
10. The apparatus of claim 9, wherein the sending of the SC-MCCH change notification is conditioned on: the SC-MCCH is provided with newly added MBMS configuration information or the existing MBMS configuration information on the SC-MCCH changes.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1 to 8.
12. A base station, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to implement the method of any of claims 1-8 via execution of the executable instructions.
13. A communication system, comprising: the base station and UE of claim 12.
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