CN103533662B

CN103533662B - Uplink scheduling request method, uplink dispatch method and equipment thereof

Info

Publication number: CN103533662B
Application number: CN201310452179.XA
Authority: CN
Inventors: 付喆; 许芳丽; 张大钧
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-09-27
Filing date: 2013-09-27
Publication date: 2017-01-04
Anticipated expiration: 2033-09-27
Also published as: CN103533662A; CN105873227A

Abstract

The invention discloses uplink scheduling request method, uplink dispatch method and equipment thereof.In the present invention, under the scene that the polymerization of many base stations particularly carries separation, transmitting uplink data demand in direct mode or is notified to SeNB community indirectly by MeNB mode by UE, so that SeNB community is according to the transmitting uplink data demand of this UE, dispatch this UE and carry out uplink on this SeNB community, solve and under this scene, how to make network or UE transmitting uplink data demand and ascending resource request, the problem of dispatching uplink data transmission, it is ensured that system and the performance of user.

Description

Uplink scheduling request method, uplink scheduling method and equipment thereof

Technical Field

The present invention relates to the field of communications, and in particular, to an uplink scheduling request method, an uplink scheduling method, and an apparatus thereof.

Background

A Network architecture of E-UTRAN (evolved Universal Radio Access Network, evolved Universal Terrestrial Radio Access Network) is shown in fig. 1, where the E-UTRAN is composed of enbs (evolved nodebs, evolved node bs, i.e., base stations). The eNB completes an access network function, and communicates with a UE (User Equipment, i.e., a terminal) through an air interface. There is both a control plane connection and a user plane connection between the UE and the eNB. For each UE attached to the network, it is served by an MME (mobility Management Entity), which is connected to the eNB using S1-MME interface. The S1-MME interface provides the UE with services to the control plane, including mobility management and bearer management functions. The S-GW (Serving gateway) is connected with the eNB by adopting an S1-U interface, and for each UE attached to the network, one S-GW provides services for the UE. The S1-U interface provides user plane service for the UE, and user plane data of the UE is transmitted between the S-GW and the eNB through the S1-U bearer.

With the rapid development of intelligent terminals and the continuous increase of data service rate and capacity requirements of users, the traditional macro base station single-layer coverage network cannot meet the service requirements of people. Therefore, 3GPP introduced a layered networking approach to solve this problem: by arranging some low-power nodes (called Local eNB or Small cell including Femto, Pico or relay) in a hot spot area, a home indoor environment, an office environment and other Small coverage environments, the method provides Small-range coverage, obtains the effect of cell splitting, and enables an operator to provide services with higher data rate and lower cost for users.

In the case of hierarchical networking, in order to enhance mobility management or increase peak rate, a UE may aggregate resources of cells of multiple base stations, and further may support a Bearer-separated network architecture, so that a part of Radio Bearers (RBs) and RRC (Radio Resource Control) connections of the UE are maintained in a cell managed by a MeNB (Master eNB, Master base station), and another part of Radio bearers are maintained in a cell managed by a SeNB (slave eNB, slave base station).

In the scenario of bearer separation, a part of data bearers of the UE are maintained and managed on the MeNB cell, another part of data bearers are maintained and managed on the SeNB cell, and a control plane bearer of the UE is maintained and managed by the MeNB cell.

For a UE supporting multiple base stations, especially bearer separation, the bearers transmitted by the UE at different base stations are different. When the service borne on the SeNB by the UE side has an uplink data transmission requirement, if the uplink data transmission requirement of the UE on the SeNB cannot be notified to the SeNB in time, the corresponding uplink data cannot be scheduled, so that the uplink data cannot be transmitted in time, the transmission delay is greatly increased, and the system and UE performance are reduced.

Therefore, how to make the network side know that the UE has an uplink data transmission requirement in the SeNB needs to be considered, so as to further schedule the UE to perform uplink data transmission in the SeNB cell.

Disclosure of Invention

The embodiment of the invention provides an uplink scheduling request method, an uplink scheduling method and equipment thereof, which are used for enabling a network side to acquire the uplink data transmission requirement of a terminal when the terminal needs to transmit uplink data to a slave base station under the scene of multi-base-station aggregation, particularly bearer separation.

An uplink scheduling request method includes:

when a terminal has an uplink data transmission requirement on a slave base station, the terminal indicates the terminal to a master base station that the terminal has the uplink data transmission requirement on the slave base station, so that the indication is sent to the slave base station through the master base station.

An uplink scheduling method includes:

the method comprises the steps that a slave base station receives an indication that a terminal forwarded by a master base station has an uplink data transmission requirement on the slave base station, wherein the indication is sent by the terminal when the terminal has the uplink data transmission requirement on the slave base station;

and the subordinate base station initiates a non-competitive random access process to the terminal or allocates uplink transmission resources for the terminal to perform the uplink data transmission according to the indication.

An uplink scheduling method includes:

the method comprises the steps that a master control base station receives an indication that an uplink data transmission requirement exists on a subordinate base station and is sent by a terminal, wherein the indication is sent by the terminal when the uplink data transmission requirement exists on the subordinate base station;

and the master base station sends the indication to the slave base station.

A terminal, comprising:

the first processing module is used for indicating the terminal to have the uplink data transmission requirement on the slave base station to the master base station when the terminal has the uplink data transmission requirement on the slave base station, so that the indication is sent to the slave base station through the master base station.

A base station, the base station being a slave base station, the slave base station comprising:

the first processing module is used for receiving an indication that the terminal forwarded by the master base station has an uplink data transmission requirement on the slave base station, wherein the indication is sent by the terminal when the terminal has the uplink data transmission requirement on the slave base station;

and the second processing module is used for initiating a non-contention random access process to the terminal or allocating uplink transmission resources for the terminal to perform the uplink data transmission according to the indication.

A base station, the base station being a master base station, the master base station comprising:

the receiving module is used for receiving an indication that the terminal has an uplink data transmission requirement on the subordinate base station, wherein the indication is sent by the terminal when the terminal has the uplink data transmission requirement on the subordinate base station;

and the first transmitting module is used for transmitting the indication to the slave base station.

An uplink scheduling request method, the method comprising:

and when the subordinate base station has an uplink data transmission requirement, the terminal sends a special scheduling request message or a random scheduling request message to the subordinate base station.

An uplink scheduling method includes:

a subordinate base station receives a special scheduling request message or a random scheduling request message sent by a terminal, wherein the special scheduling request message or the random scheduling request message is sent by the terminal when the terminal has an uplink data transmission requirement on the subordinate base station;

and the subordinate base station initiates a non-competitive random access process to the terminal or allocates uplink transmission resources for the terminal to perform uplink data transmission according to the special scheduling request message or the random scheduling request message.

A terminal, comprising:

the first processing module is used for sending a special scheduling request message or a random scheduling request message to the subordinate base station when the terminal has an uplink data transmission requirement on the subordinate base station.

a first processing module, configured to receive a dedicated scheduling request message or a random scheduling request message sent by a terminal, where the dedicated scheduling request message or the random scheduling request message is sent by the terminal when there is an uplink data transmission requirement on a slave base station;

and the second processing module is used for initiating a non-competitive random access process to the terminal or distributing uplink transmission resources for the terminal to perform uplink data transmission according to the special scheduling request message or the random scheduling request message.

In the above embodiment of the present invention, in a scenario of multi-base-station aggregation, especially bearer separation, a UE notifies an SeNB cell of an uplink data transmission requirement in a direct manner or indirectly through an MeNB manner, so that the SeNB cell schedules the UE to perform uplink transmission on the SeNB cell according to the uplink data transmission requirement of the UE, which solves the problem how to enable a network to know the uplink data transmission requirement and an uplink resource request of the UE and schedule uplink data transmission in the scenario, and ensures performance of a system and a user.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a diagram of an e-UTRAN network architecture in the prior art;

FIG. 2 is a schematic diagram of a hierarchical network deployment scenario in the prior art;

fig. 3A is a schematic diagram of a contention random access procedure in the prior art;

FIG. 3B is a diagram illustrating a non-contention random access procedure in the prior art;

fig. 4 is a schematic diagram of an uplink scheduling process according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an uplink scheduling procedure according to another embodiment of the present invention;

fig. 6 to fig. 9 are signaling diagrams of uplink scheduling flows according to embodiments of the present invention;

fig. 10A and 10B are schematic structural diagrams of a terminal according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a terminal according to another embodiment of the present invention;

fig. 13 is a schematic structural diagram of a base station according to another embodiment of the present invention;

fig. 14 is a schematic structural diagram of a base station according to another embodiment of the present invention.

Detailed Description

The embodiment of the invention is suitable for multi-base-station aggregation, in particular to a scene of load separation.

Fig. 2 shows a typical hierarchical network architecture. As shown in fig. 2, a Macro base station (referred to as Macro eNB) provides basic coverage, a low power local node (labeled Small cell in the figure) provides hot spot coverage, a data and/or signaling interface (which may be a wired or wireless interface) exists between the local node and the Macro eNB, and a UE may operate under the Macro eNB or the local node. Since the local node has a small cell coverage and serves a small number of UEs, UEs connected to the local node often obtain better quality of service. Therefore, when a UE connected to a Macro eNB enters the coverage of a cell corresponding to a local node, the UE may be transferred to the local node to obtain a service provided by the local node; when the UE is far away from the coverage area of the cell corresponding to the local node, the UE needs to be transferred to the cell controlled by the Macro eNB to maintain wireless connection.

The network architecture shown in fig. 2 may support bearer separation. In the overlapping coverage area of a Macro eNB Cell and a Small Cell under a bearer separation scene, the UE supporting bearer separation can work under the Macro eNB and the Small Cell simultaneously and use the resources of a plurality of base stations.

It is generally believed that: in a scenario of multi-base station aggregation (including base station aggregation with separated bearers), among a plurality of base stations aggregated by a UE, a base station Macro eNB providing Macro coverage is used as a Master base station Master eNB (or MeNB), and a Small Cell base station providing hot spot coverage is used as a Secondary eNB (or SeNB). In the following, a base station providing macro coverage and maintaining RRC connection with the UE is referred to as MeNB, and another base station aggregated by the UE is referred to as SeNB.

Particularly, when the UE supports CA (Carrier Aggregation) under the SeNB, the UE may have a cell (hereinafter referred to as SeNB PCell) similar to the primary cell MeNB PCell of the master base station under the SeNB, and the cell has a function similar to the MeNB PCell, supports data transmission, is configured with a PUCCH, and the like, but cannot be used as a cell where RRC link maintenance of the UE is performed.

The embodiments of the present invention relate to a random access procedure, and in order to more clearly understand the embodiments of the present invention, first, a brief description is given below of the random access procedure provided in the prior art.

A Random Access Procedure (RA Procedure) is a Procedure necessary for establishing a radio link between the UE and the network. Regular data transmission and reception between the eNB and the UE is possible only after the random access is completed. The UE can implement two basic functions through random access: (1) acquiring uplink synchronization with the eNB; (2) and applying for uplink transmission resources. The random access procedure is applied to the following 6 scenarios: (1) initial access to the cell from an RRC IDLE state, i.e. RRC connection establishment; (2) recovering after the radio link fails, namely RRC connection reestablishment; (3) synchronizing with a target cell in the switching process; (4) downlink data arrives and the UE air interface is in an uplink out-of-step state; (5) when uplink data arrives and a UE air interface is in an uplink out-of-step state, or although the uplink data does not go out of step, uplink transmission resources need to be applied through random access; (6) for auxiliary positioning, the network acquires Timing Advance (TA) by using random access.

In the Random Access process, the UE sends a Preamble code to the eNB on a PRACH (Physical Random Access Channel), and Based on whether the Preamble code selected by the UE may collide, the Random Access process may be divided into two types, namely, a Contention Based Random Access (CBRA) and a non-Contention Random Access (CFRA). For the establishment of RRC connection, the reestablishment of RRC connection, the arrival of UL (Uplink) data in a scene, the random access is autonomously triggered by UE (user equipment), and the eNB does not have any prior information, so that the competitive random access is carried out; for a handover scenario, DL (Downlink) data arrives, and the UE initiates non-contention random access according to the eNB indication.

Fig. 3A illustrates a contention random access procedure, which may include:

(1) msg 1: sending random access Preamble

The message is a UL message. The eNB is responsible for configuring the Preamble code and PRACH channel resources for transmitting the Preamble code, and notifying the UE of the configuration result (including ra-Preamble Index, PRACH-ConfigIndex, PRACH Mask Index, etc.).

The Preamble set for contention random access may be further divided into two Preamble code groups: group A and group B. After selecting the Preamble code group, the UE randomly and uniformly selects one Preamble code from all the Preamble codes corresponding to the code group, randomly and uniformly selects one PRACH channel in three consecutive subframes starting from the first subframe containing the PRACH channel, and transmits the selected Preamble code on the selected PRACH channel.

(2) Msg 2: random Access Response (RAR)

The message is a DL message. The message is a response by the eNB to the UE after receiving Msg1, and the random access response message is sent in a random access response window. The UE detects a Physical Downlink Control Channel (PDCCH) scrambled by an RA-RNTI (RA-Radio Network Temporary Identity) on a CSS (common search space) on a PCell (primary cell) to detect the RAR message.

(3) Msg 3: scheduling transmissions

The message is a UL message. And after the UE correctly receives the Msg2, transmitting the Msg3 in the allocated uplink transmission resource.

(4) Msg 4: contention resolution

The message is a DL message, which is used to resolve potential contention and determine the specific UE that completes the random access procedure. The UE starts a contention resolution timer at the time of the Msg3 transmission and restarts this timer at each Msg3 retransmission. The Msg4 content corresponds to the Msg3 content.

Fig. 3B illustrates a flow of a non-contention random access procedure, which may include:

(1) msg 0: random access indication

The Msg0 message content includes PRACH resources and Preamble resources used by the UE to initiate a non-contention RA.

(2) Msg 1: sending Preamble code

The transmitted Preamble code has been allocated and indicated by the eNB, so the UE does not need to select the Preamble code group and the Preamble code. If the eNB does not indicate that the PRACH channel set is allowed to be used, the UE randomly and uniformly selects a PRACH channel in a first subframe containing the PRACH channel; otherwise, the UE selects a first PRACH channel from the set of PRACH channels allowed to be used. And then the UE sends the appointed Preamble code on the selected PRACH channel.

(3) Msg 2: random Access Response (RAR)

The sending and receiving of the RAR message is substantially the same as the processing in the contention random access procedure. The difference lies in that:

a) non-contention random access has no contention, so that the transmission of the Msg3 is not involved, and Msg3 transmission resource allocation information does not need to be contained in a random access response message;

b) when the Preamble code needs to be sent again after the random access response message is failed to be received, the UE does not need to wait for a period of time based on the backoff indication, but can directly start the determination of the PRACH channel and the transmission of the Preamble code;

c) and if the UE judges that the random access response message is successfully received, the whole non-competitive random access process is considered to be successfully finished.

The embodiment of the invention provides the following two uplink scheduling schemes aiming at the scene of multi-base station aggregation, particularly bearer separation:

the first scheme is as follows: and the UE and the SeNB directly interact to complete the uplink data transmission request and the uplink scheduling process.

Scheme II: and the UE and the SeNB interact through the MeNB to complete the uplink data transmission request and the uplink scheduling process.

The two uplink scheduling schemes are described below with reference to the accompanying drawings.

Fig. 4 is a schematic flow chart of the first solution according to the embodiment of the present invention. As shown, the process may include:

step 401: when the UE has an uplink data transmission requirement on the SeNB, the UE sends a D-SR (Dedicated Scheduling Request) message or an RA-SR (Random Access Scheduling Request) message to the SeNB. In specific implementation, when the network configures the D-SR on the SeNB for the UE, the UE may send the D-SR to the SeNB using the dedicated resource allocated to the UE by the network side. When the network does not configure the D-SR for the UE on the SeNB or the D-SR fails (e.g., the D-SR transmission exceeds the maximum transmission number), the UE may request uplink resources from the SeNB by initiating a non-contention random access procedure.

Step 402: after receiving the D-SR or RA-SR sent by the UE, the SeNB allocates uplink transmission resources for the uplink data transmission of the UE according to the D-SR; or initiating a non-contention random access process to the UE according to the RA-SR, or allocating uplink transmission resources for the UE to perform the uplink data transmission.

In specific implementation, after receiving the RA-SR sent by the UE, the SeNB may further determine an uplink synchronization state of the UE, and if the UE is in the uplink out-of-synchronization state, determine to initiate a non-contention random access procedure to the UE, and if the UE is in the uplink synchronization state, determine to initiate a non-contention RA procedure to the UE or allocate uplink transmission resources to the UE.

In a preferred manner of the procedure shown in fig. 4, the SeNB may configure a dedicated preamble for the UE when the bearer of the UE is detached to the SeNB, where the dedicated preamble is dedicated to the UE to initiate a non-contention random access procedure on the SeNB. In step 401, the UE may send the dedicated preamble on the cell of the SeNB, so as to request uplink synchronization or uplink scheduling from the SeNB. In step 402, the SeNB may send a random access response message to the UE in the following manner:

the first method is as follows: and the SeNB uses a PDCCH scrambled by a C-RNTI (Cell-Radio Network Temporary Identity) to send a random access response message to the UE on the Cell of the subordinate base station sending the special preamble, wherein the random access response message carries the uplink transmission resource distributed by the SeNB for the UE. Correspondingly, the UE detects a PDCCH scrambled by using a C-RNTI (the C-RNTI is detected by the SeNB from the cell which sends the special preamble, and the C-RNTI uniquely identifies the UE on the subordinate base station) on the SeNB cell which sends the special preamble, acquires a random access response message according to the detected PDCCH, and acquires uplink transmission resources distributed by the SeNB for the UE to perform uplink data transmission according to the random access response message.

The second method comprises the following steps: under the condition that the UE supports a CSS (common search area) search in an SeNB cell, the SeNB may send a Random Access response message to the UE using a PDCCH scrambled by an RA-RNTI (Random Access-Radio Network Temporary Identity) in a cell of a subordinate base station that sends the dedicated preamble, where the Random Access response message carries uplink transmission resources allocated by the SeNB to the UE. Optionally, the TC-RNTI information carried in the random access response message is a value of the C-RNTI of the UE in the cell of the SeNB, and the C-RNTI uniquely identifies the UE in the cell of the SeNB.

Correspondingly, the UE detects the PDCCH scrambled by using the RA-RNTI on the CSS of the SeNB cell which sends the special preamble, acquires a random access response message according to the detected PDCCH, and acquires uplink transmission resources which are allocated by the SeNB for the UE for uplink data transmission according to the random access response message. The SeNB cell may be a cell of a subordinate base station that sends a dedicated preamble, or may be a primary cell SeNB Pcell of the subordinate base station. In order to distinguish the UE, if the SeNB cell that sends the dedicated preamble is the SeNB Pcell, a mode of carrying information of the cell that sends the dedicated preamble in the RA-RNTI used for scrambling the PDCCH, or a mode of staggering contention random access preamble resource overlapping of non-contention random access preamble resources of different cells belonging to the base station, or a mode of adopting TC-RNTI information carried in the random access response message as a value of C-RNTI of the UE in the cell of the SeNB (the C-RNTI uniquely identifies the UE in the cell of the SeNB) may be adopted.

The third method comprises the following steps: the SeNB sends a random access response message to the MeNB, which sends the random access response message to the UE on the Pcell (primary cell) using the PDCCH scrambled by the RA-RNTI. The cell information carried in the RA-RNTI is the cell information for sending the special random access preamble, or the TC-RNTI information carried in the random access response message is the value of C-RNTI, the C-RNTI uniquely identifies the UE on the SeNB, and the UE is identified by the same configuration of the subordinate base station and the master base station, or the competition random access preamble resources of the master base station and the subordinate base station are overlapped and the non-competition random access preamble resources are staggered.

Correspondingly, the UE detects a PDCCH scrambled by using an RA-RNTI on a CSS of the MeNB Pcell, acquires a random access response message according to the detected PDCCH, and acquires uplink transmission resources allocated by the SeNB for the UE for uplink data transmission according to the random access response message if cell information carried in the RA-RNTI is the cell information for sending the special random access preamble, or TC-RNTI information carried in the random access response message is the value of the C-RNTI (the C-RNTI uniquely identifies the UE on the SeNB), or competition random access preamble resources of the master base station and the slave base station are overlapped and non-competition random access preamble resources are staggered.

In a preferred mode of the procedure shown in fig. 4, the UE sends a D-SR or an RA-SR to the SeNB in step 401. In step 402, the SeNB initiates a non-contention random access procedure to the UE. The non-contention random access procedure may include: the SeNB configures resources for sending random access preamble codes to the UE, receives preamble sent by the UE on the cell of the SeNB according to the resources, and triggers the SeNB to send a random access response message. The procedure for the SeNB to send the random access response message is similar to the procedure for sending the random access response message in the first, second, or third manner, and is not described in detail here, except that the preamble involved is the preamble received from the UE in step 402.

As can be seen from the process shown in fig. 4, in a scenario of multi-base station aggregation, especially bearer separation, the UE directly notifies the SeNB cell of an uplink data transmission requirement, so that the SeNB cell schedules the UE to perform uplink transmission on the SeNB cell according to the uplink data transmission requirement of the UE, which solves the problem of how to enable the network to know the UL data transmission requirement and UL resource requirement of the UE and schedule UL data transmission in the scenario, and ensures performance of the system and the user.

Fig. 5 is a schematic flow chart of the second solution according to an embodiment of the present invention. As shown, the process may include:

step 501: when the UE has an uplink data transmission requirement on the slave base station (for example, uplink data transmission needs to be performed to the SeNB), the UE indicates to the MeNB that the UE has the uplink data transmission requirement on the SeNB. In specific implementation, the UE may send uplink data transmission requirement indication information to the MeNB, where the uplink data transmission requirement indication information is used to indicate that the UE needs to perform uplink data transmission to the SeNB and request uplink transmission resources.

Further, the UE may send the uplink data transmission requirement indication information to the MeNB using L1 signaling or RRC signaling or BSR (Buffer State Report) MAC CE (media access control element) or a newly defined MAC CE. The uplink data transmission requirement indication information indicates a cell of an SeNB requested by the UE to perform uplink data transmission (i.e., the SeNB cell is a cell for which the UE requests uplink transmission resources).

Further, the L1 signaling may be a dedicated scheduling request message, where a resource of the dedicated scheduling request message is a resource pre-allocated to the UE on the MeNB and dedicated to the terminal to transmit uplink data transmission requirement indication information of the slave base station on the master base station. Correspondingly, after receiving the dedicated scheduling request message, the MeNB forwards the dedicated scheduling request message to the cell of the SeNB indicated by the request message or notifies the SeNB UE that there is an uplink data transmission requirement in the cell of the SeNB indicated by the request message.

Step 502: the MeNB forwards the request or notification (or uplink data transmission need indication information) to the SeNB. In a specific implementation, the MeNB may forward the request to the corresponding cell according to the cell of the SeNB indicated in the uplink data transmission requirement indication information (i.e., the cell of the SeNB requested by the UE to perform uplink data transmission). Or, the MeNB may notify the SeNB UE that there is an uplink data transmission requirement in the cell of the SeNB indicated by the request message according to the cell of the SeNB indicated by the uplink data transmission requirement indication information (i.e., the cell of the SeNB requested by the UE to perform uplink data transmission).

Step 503: and the SeNB initiates a non-contention random access process to the UE or allocates uplink transmission resources for the UE to perform the uplink data transmission according to the indication.

In step 503, the SeNB may first determine an uplink synchronization state between the UE and the SeNB cell requested by the UE to perform uplink data transmission, and if the uplink synchronization state is an out-of-synchronization state, the SeNB initiates a non-contention random access process to the UE; and if the UE is in an uplink synchronization state, determining to initiate a non-contention RA (random access) process to the UE or allocate uplink transmission resources for the uplink data transmission of the UE. The non-contention random access procedure initiated by the SeNB to the UE may adopt the non-contention random access procedure described in step 402 in fig. 4.

As can be seen from the process shown in fig. 5, in a scenario of multi-base station aggregation, especially bearer separation, the UE notifies the SeNB cell of an uplink data transmission requirement through the MeNB, so that the SeNB cell schedules the UE to perform uplink transmission on the SeNB cell according to the uplink data transmission requirement of the UE, which solves the problem of how to enable the network to know the UL data transmission requirement and UL resource request of the UE and schedule UL data transmission in the scenario, and ensures performance of the system and the user.

In order to more clearly illustrate the embodiments of the present invention, the first embodiment will be described in detail by the following embodiments, and the second embodiment will be described in detail by the second embodiment, the third embodiment and the fourth embodiment.

Example one

In this embodiment, when the MeNB determines that it is necessary to transfer a part of the bearers of the UE supporting bearer splitting to the SeNB for transmission according to the conditions of the load and the like, the MeNB sends bearer splitting request messages to the SeNB and the UE, respectively. After receiving the MeNB bearer separation request message, the SeNB allocates corresponding radio resources to the UE, where the resources include 1 dedicated preamble (decoded preamble) configured by the SeNB for the UE, and are used by the subsequent UE to initiate a non-contention random access process on the SeNB. The dedicated preamble configuration may be notified to the UE by the MeNB during the bearer separation process, or may be notified to the UE by the MeNB or the SeNB in the bearer separation state. The dedicated preamble may be allocated to a specific cell of the SeNB by the network, or may be allocated to all cells of the SeNB, that is, the dedicated preamble is applicable to all cells on the SeNB.

As shown in fig. 6, in step 601, if the UE has an uplink data transmission requirement on the SeNB and needs to request an uplink transmission resource, for example, a logical channel in a logical channel group has uplink data to be transmitted in an RLC (Radio Link Control) entity or a PDCP (packet data Convergence Protocol) entity, and the UE and a cell of the SeNB are in an uplink out-of-synchronization state or a D-SR of the corresponding SeNB is not configured or a D-SR configuration fails, in step 602, the UE uses a dedicated preamble configured by a network side to select a PRACH resource on the SeNB cell that needs to perform uplink data transmission to transmit the dedicated preamble, that is, the dedicated preamble is used to initiate a non-contention random access procedure to the SeNB. In steps 603-604, after the SeNB receives the dedicated preamble, by detecting an uplink synchronization state maintained by the SeNB with the UE, if it is determined that the UE is currently in an uplink out-of-synchronization state, a non-contention random access procedure is completed or initiated; and if the UE is determined to be in the uplink synchronous state currently, allocating uplink transmission resources for the UE. Or, after the SeNB receives the dedicated preamble, it directly completes or initiates the non-contention random access procedure. The completion of the non-contention random access process means that an RAR message is sent at the moment; the initiating the non-contention random access process refers to: the SeNB configures a resource (Msg 0) for sending preamble to the UE, so that the UE sends the preamble (Msg 1), and the SeNB returns a RAR message (Msg 2), namely, the UE is triggered to initiate a non-contention random access process.

The RAR message generated by the SeNB may be directly sent to the UE, or may be forwarded to the UE through the MeNB (fig. 6 only shows a case where the SeNB directly sends the RAR message to the UE).

The implementation process of step 604 and the subsequent non-contention random access initiated by the SeNB is described below by taking the SeNB to initiate the non-contention random access process as an example.

Msg 0: the SeNB allocates preamble resources and/or PRACH resources to the UE through the PDCCH order (PDCCH order) scrambled by the C-RNTI (step 604).

Msg 1: and the UE sends the selected preamble code on the SeNB cell by using the selected PRACH resource according to the preamble resource and/or the PRACH resource configured by the SeNB.

The Msg2 may be sent in one of three ways:

mode A: and after receiving the preamble (Msg 0), the SeNB schedules the RAR message through the PDCCH scrambled by the C-RNTI. The UE detects in the cell sending the preamble, judges whether the non-competitive random access is successful according to whether the detected RAR message carries the preamble code identification sent by the UE, and acquires a TAC MAC CE (Timing advanced Command MAC CE) and a UL-grant under the condition that the non-competitive random access is successful. The TAC may also be detected from the information of the C-RNTI scheduling. Thereafter, the UE may transmit uplink data to the SeNB on the corresponding uplink transmission resource according to the TAC and the UL-grant. Correspondingly, the UE may open an RAR window after 2ms after sending the preamble, and check for a possible RAR message.

Mode B: and under the condition that the UE supports CSS detection on the SeNB cell, after the SeNB receives the preamble, scheduling the RAR message through the PDCCH scrambled by the RA-RNTI. And the UE detects on the cell sending the preamble, judges whether the non-competitive random access is successful according to whether the detected RAR message carries the preamble code identification sent by the UE, and acquires the TAC and the UL-grant under the condition of successful non-competitive random access. Thereafter, the UE may transmit uplink data to the SeNB on the corresponding uplink transmission resource according to the TAC and the UL-grant. The SeNB cell may be a cell of a subordinate base station that sends a dedicated preamble, or may be a primary cell SeNB Pcell of the subordinate base station.

Mode C: and after receiving the preamble, the SeNB generates a corresponding RAR subheader and a RAR message, and then sends the RAR message to the MeNB. The MeNB schedules a SeNB RAR message for the UE on the MeNB PCell via a PDCCH scrambled by the RA-RNTI. And the UE detects on the MeNB PCell (the RAR window is prolonged, the minimum length is 2+ backhaul delay, the maximum length is 10ms + backhaul delay), judges whether the non-competitive random access is successful or not, and acquires the TAC and the UL-grant under the condition that the non-competitive random access is successful. Thereafter, the UE may transmit uplink data to the SeNB on the corresponding uplink transmission resource according to the TAC and the UL-grant.

In the above mode B or mode C, the UE may distinguish random access between different cells between different base stations in a similar manner to CA (carrier aggregation), and the usable mode includes one of the following: the RA-RNTI carries cell information (the UE is also distinguished by the distinguishing cell + preamble identifier), or the enbs achieve staggering non-contention random access resources (for example, each eNB uses different non-contention preamble resources and the same contention preamble resources, for example, different cells under each eNB use different non-contention preamble resources), or the C-RNTI used by the UE under the SeNB in the RAR message replaces the value of the original TC-RNTI field in the RAR (the C-RNTI is allocated by the aggregated base station unified scheduling, and the UE is configured to use the same C-RNTI in the aggregated cell under the same base station).

In addition, if the SeNB supports a carrier aggregation multiple TA (CA multi-TA) scenario, the SeNB may send an RAR message on the PCell, and correspondingly, the UE may also receive the RAR message on the SeNB PCell. In this scenario, the UE needs to add a cell identifier when sending the preamble, and the SeNB also needs to embody corresponding cell identifier information when scheduling the RAR message. For example, the RA-RNTI of the scrambled PDCCH carries cell information, the enbs realize staggering non-contention random access resources (for example, each eNB uses different non-contention preamble resources but uses overlapped contention preamble resources), the RAR message carries C-RNTI, and the like.

In the flow shown in fig. 6, if the non-contention random access procedure (i.e., RAR sending) is completed in step 604, the specific implementation is similar to the Msg2 sending and processing procedure in the above-mentioned manner a, manner B, or manner C, and the preamble involved in this case is the dedicated preamble sent by the UE in step 602.

Example two

In this embodiment, the UE supporting bearer separation operates in the MeNB and the SeNB simultaneously, and performs data transmission and processing with the MeNB and the SeNB, respectively.

When the UE has an uplink transmission requirement on the SeNB, the UE informs the MeNB UE of the uplink data transmission requirement on the SeNB in a manner of reporting an indication, such as an indication of the uplink data transmission requirement of the SeNB; and the MeNB informs the SeNB of the UE requirement according to the reporting indication information, and the SeNB executes the CFRA or allocates UL resources. The reported indication information may be BSR MAC CE, or new MAC CE may be introduced.

As shown in fig. 7, in step 701, if the UE has an uplink data transmission requirement in the SeNB, and is in an uplink out-of-synchronization State between the UE and the SeNB cell, or the D-SR corresponding to the SeNB is not configured, or the D-SR configuration fails, and the UE and the MeNB cell are still in an uplink synchronization State, in step 702, the UE sends a BSR (Buffer State Report) corresponding to the SeNB to the MeNB cell. The BSR sent by the UE includes a cell identifier or a logical channel identifier, and may indicate a target SeNB cell (i.e., an SeNB cell that needs to perform uplink data transmission) corresponding to the BSR information by extending a BSRMAC CE format or introducing a new LCID (logical channel group identifier) manner. Wherein, an extended BSR MAC CE mode is adopted as a display indication mode, namely the BSR MAC CE carries the cell identifier of the target SeNB; the newly defined LCID mode is used as an implicit mode, that is, the MeNB can determine the corresponding target SeNB through the LCID.

In step 703, after receiving the BSR sent by the UE, the MeNB determines whether the BSR is for the local base station (MeNB) or the SeNB by using the stored correspondence between the cell and the base station or the correspondence between the logical channel and the base station (the base stations supporting bearer separation each store the correspondence between the cell or the logical channel corresponding to the UE and the base station). If the MeNB determines that the BSR is sent to the SeNB, in step 704, the MeNB interacts information such as the BSR and the UE identity with the SeNB. In steps 705-706, the SeNB determines the current synchronization state of the UE and the SeNB cell according to the notification of the MeNB and the uplink synchronization state (e.g., SeNB cell TAT) maintained by the SeNB and the UE, and initiates a non-contention random access procedure if it is determined that the UE is currently in an uplink out-of-synchronization state; and if the UE is determined to be in the uplink synchronous state currently, scheduling the UE for uplink transmission, allocating uplink transmission resources for the UE, or initiating a non-competitive random access process. And in the initiated non-contention random access process, the SeNB allocates preamble resources and/or PRACH resources for the UE through the PDCCH order scrambled by the C-RNTI. And the UE sends the selected preamble code on the SeNB cell by using the selected PRACH resource according to the preamble resource and/or the PRACH resource configured by the SeNB, and receives the corresponding RAR message.

The RAR message may be sent directly to the UE, or may be forwarded to the UE through the MeNB (fig. 7 only shows the case where the SeNB sends the RAR message directly to the UE). In particular, when non-contention random access resources are insufficient, the UE may be instructed to initiate a contention random access procedure.

In the above procedure, the non-contention random access procedure initiated by the SeNB is similar to the non-contention random access procedure initiated by the SeNB in the first embodiment, and is not described in detail here.

In specific implementation, in step 702 of the above procedure, the UE opens a RAR window after sending the BSR. The UE may detect the RAR message on the SeNB cell sent by the BSR (i.e., the SeNB cell corresponding to the BSR), or may detect the RAR message of the SeNB on the MeNB PCell.

EXAMPLE III

In this embodiment, the UE supporting bearer separation operates in the MeNB and the SeNB simultaneously, and performs data transmission and processing with the MeNB and the SeNB, respectively. The base stations supporting bearer separation respectively store the corresponding relation between the cell or logical channel of the corresponding UE and the base station.

As shown in fig. 8, in step 801, if the UE has an uplink transmission requirement in the SeNB, and the UE is in an uplink out-of-synchronization state with the SeNB cell, or the D-SR of the corresponding SeNB is not configured or the D-SR configuration fails, and the UE is still in an uplink synchronization state with the MeNB cell, in step 802, the UE sends a data transmission requirement (e.g., uplink data transmission requirement indication information) of the UE in the SeNB through the MeNB cell. The uplink data transmission requirement indication information may be a newly defined RRC signaling. The indication information may simultaneously carry information such as a cell identifier or a logical channel (group) identifier, a reporting reason (e.g., an enb UL loss of synchronization and uplink data reaching, an SeNB UL resource request, etc.), and the like.

After receiving the indication information sent by the UE in step 803, if it is determined that the indication information is for the SeNB, the MeNB interacts the indication information with the corresponding SeNB in step 804. In steps 805-806, the SeNB determines the current synchronization state of the UE and the SeNB cell according to the notification of the MeNB and the uplink synchronization state (e.g., SeNB cell TAT) maintained by the SeNB and the UE, and initiates a non-contention random access procedure if it is determined that the UE is currently in an uplink out-of-synchronization state; and if the UE is determined to be in the uplink synchronous state currently, scheduling the UE for uplink transmission, and allocating uplink transmission resources for the UE or initiating a non-competitive random access process. And in the initiated non-contention random access process, the SeNB allocates preamble resources and/or PRACH resources for the UE through the PDCCH order scrambled by the C-RNTI. And the UE sends the selected preamble code on the SeNB cell by using the selected PRACH resource according to the preamble resource and/or the PRACH resource configured by the SeNB, and receives the corresponding RAR message. In particular, when non-contention random access resources are insufficient, the UE may be instructed to initiate a contention random access procedure.

Example four

When the UE has an uplink transmission requirement on the SeNB, the UE informs the MeNB UE of the uplink data transmission requirement on the SeNB in a manner of reporting an indication, such as an indication of the uplink data transmission requirement of the SeNB; and the MeNB informs the SeNB of the UE requirement according to the reporting indication information, and the SeNB executes the CFRA or allocates UL resources. The reported indication information may be L1 signaling, such as dedicated D-SR resources.

And pre-configuring a special D-SR resource on the MeNB PCell, wherein the resource is a special resource for the SeNB and is used for enabling the MeNB to know the random access requirement of the SeNB. The resource may be configured to the UE in a process in which the MeNB triggers the UE to perform bearer separation, and may be stored by the UE. When the UE has an uplink transmission requirement on the SeNB, the UE uses the dedicated D-SR to send uplink data transmission requirement indication information, and the MeNB receives the uplink data transmission requirement indication information on the dedicated resource, so that it can be known that the UE has an uplink data transmission requirement on the SeNB.

As shown in fig. 9, in step 901, if the UE has an uplink data transmission requirement in the SeNB, and the UE is in an uplink out-of-synchronization state with the SeNB cell, or the D-SR of the corresponding SeNB is not configured or the D-SR configuration fails, but the UE is still in an uplink synchronization state with the MeNB cell, in step 902, the UE notifies the MeNB of the current state of the UE and the uplink data transmission requirement by sending uplink data transmission requirement indication information through the D-SR dedicated resource configured by the MeNB to the UE. In steps 903 to 904, after receiving and decoding the indication information on the D-SR dedicated resource, the MeNB sends a notification message to the SeNB, where the notification message may include: UE identity, non-contention random access trigger request message, etc. The notification message may be L1 signaling, such as D-SR; or may be a notification message between base stations (the MeNB may notify the SeNB UE that there is an uplink data transmission demand in the cell of the SeNB indicated by the request message according to the cell of the SeNB indicated by the uplink data transmission demand indication information).

In step 905, if the SeNB determines that the UE is currently in the uplink synchronization state according to the notification message of the MeNB and the uplink synchronization state maintained by the SeNB and the UE, in step 906, an UL resource or a non-contention random access procedure is allocated to the UE, otherwise, the non-contention random access procedure with the UE is initiated. In particular, when the non-contention random access resources are insufficient, the UE will be instructed to initiate a contention random access procedure.

In summary, since the UE aggregates multiple base stations, different bearers of the UE are separately transmitted on different base stations, and when the UE has a need for sending UL data to the SeNB, if the uplink data transmission need cannot be notified to the network side in time, the UL data of the SeNB cannot be sent by the UE, which reduces the performance of the system and the UE. The embodiment of the invention aims at the scene of multi-base-station aggregation, particularly load separation, and schedules the UE to perform uplink transmission on the SeNB cell by acquiring the uplink transmission resource requirement condition of the UE in the SeNB cell, thereby solving the problem of how to enable a network to acquire the UL data transmission requirement and the UL resource request of the UE and schedule the UL data transmission in the scene, and ensuring the performance of a system and a user.

Based on the same technical concept, the embodiment of the present invention further provides a terminal and a base station, which can be applied to the first scheme, such as the implementation process of the first embodiment.

Referring to fig. 10A, the terminal may include:

a first processing module 1001, configured to send a dedicated scheduling request message or a random scheduling request message to a slave base station when the terminal has an uplink data transmission requirement on the slave base station.

Specifically, the first processing module 1001 may send the random scheduling request message to the slave base station by initiating a non-contention random access procedure using a dedicated resource allocated to the terminal by a network side. Specifically, the first processing module 1001 may send a dedicated random access preamble on the cell of the subordinate base station, where the dedicated random access preamble is a preamble uniquely allocated by the subordinate base station for the terminal and dedicated to initiate a non-contention random access procedure on the cell of the subordinate base station.

Further, the terminal may further include a second processing module 1002. A second processing module 1002, configured to detect a physical downlink control channel PDCCH scrambled by using a cell radio network temporary identifier C-RNTI or a random access radio network temporary identifier RA-RNTI in a subordinate base station cell that sends a dedicated random access preamble after the dedicated random access preamble is sent in the subordinate base station cell, obtain a random access response message according to the detected PDCCH, and obtain, according to the random access response message, an uplink transmission resource allocated by the subordinate base station for the terminal for performing the uplink data transmission; the C-RNTI is detected by the subordinate base station from a cell transmitting the dedicated random access preamble, and the C-RNTI uniquely identifies the terminal on the subordinate base station; or

Detecting a PDCCH scrambled by using a random access radio network temporary identifier RA-RNTI on a master cell of the slave base station, and acquiring a random access response message according to the detected PDCCH; if the RA-RNTI or the cell information carried in the random access response message is the information of the cell sending the special random access preamble, or the TC-RNTI information carried in the random access response message is the value of the C-RNTI of the terminal on the cell of the subordinate base station, or the non-competitive random access preamble resources of different cells of the subordinate base station are staggered, and the C-RNTI uniquely identifies the terminal on the cell of the subordinate base station, acquiring the uplink transmission resources allocated by the subordinate base station for the terminal to perform the uplink data transmission according to the random access response message; or

Detecting a PDCCH scrambled by the main control base station by using RA-RNTI on a main cell of the main control base station, and acquiring a random access response message according to the detected PDCCH; if the cell information carried in the RA-RNTI is the cell information for sending the special random access preamble, or the TC-RNTI information carried in the random access response message is the value of the C-RNTI, or the competitive random access preamble resources of the master base station and the slave base stations are overlapped and the non-competitive random access preamble resources are staggered, acquiring the uplink transmission resources distributed by the slave base stations for the terminal to transmit the uplink data according to the random access response message; the random access response message is sent to the master base station by the slave base station, the terminal is uniquely identified by the C-RNTI on the slave base station, and the slave base station and the master base station are configured with the same identifier.

As shown in fig. 10B, the terminal may further include a third processing module 1003. The third processing module 1003 may be configured to receive a resource configured by the slave base station for transmitting a random access preamble after transmitting a dedicated scheduling request message or a random scheduling request message to the slave base station; sending a random access preamble on the cell of the subordinate base station according to the resource; and detecting a PDCCH scrambled by using a C-RNTI (radio network temporary identifier) on a cell of a subordinate base station sending the random access lead code, acquiring a random access response message according to the detected PDCCH, and acquiring uplink transmission resources distributed by the subordinate base station for the uplink data transmission of the terminal according to the random access response message, wherein the C-RNTI is detected by the subordinate base station from the cell sending the random access lead code, and the C-RNTI uniquely identifies the terminal on the subordinate base station.

As shown in fig. 11, the base station may be a slave base station, and the slave base station may include:

a first processing module 1101, configured to receive a dedicated scheduling request message or a random scheduling request message sent by a terminal, where the dedicated scheduling request message or the random scheduling request message is sent by the terminal when there is an uplink data transmission requirement on a slave base station;

a second processing module 1102, configured to initiate a non-contention random access procedure to the terminal or allocate uplink transmission resources for the terminal to perform the uplink data transmission according to the dedicated scheduling request message or the random scheduling request message.

Specifically, the first processing module 1101 may receive a random scheduling request sent by the terminal through an initiated non-contention random access process according to a dedicated resource allocated to the terminal by a network side.

Specifically, the first processing module 1101 may receive a dedicated random access preamble sent by the terminal on the cell of the subordinate base station, where the dedicated random access preamble is a preamble uniquely allocated by the subordinate base station for the terminal and dedicated to initiating a non-contention random access procedure on the cell of the subordinate base station.

Specifically, the second processing module 1102 may be specifically configured to:

sending a random access response message to the terminal by using a Physical Downlink Control Channel (PDCCH) scrambled by a radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station sending the special random access preamble, wherein the random access response message carries uplink transmission resources allocated for the terminal to perform uplink data transmission, the C-RNTI is detected by the subordinate base station from the cell sending the special random access preamble, and the C-RNTI uniquely identifies the terminal on the subordinate base station; or

Transmitting a PDCCH scrambled using an RA-RNTI on a primary cell of the subordinate base station; the RA-RNTI or the random access response message carries information of a cell sending the special random access preamble, or TC-RNTI information carried in the random access response message is a C-RNTI value of the terminal on the cell of the subordinate base station, and the C-RNTI uniquely identifies the terminal on the cell of the subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered; or

Sending a random access response message aiming at the terminal to a main cell of a main control base station so that the main cell of the main control base station sends a PDCCH scrambled by RA-RNTI, wherein the PDCCH carries the random access response message aiming at the terminal; the RA-RNTI or the random access response message carries information of a cell sending the special random access preamble, or TC-RNTI information carried in the random access response message is a C-RNTI value of the terminal on the cell of the subordinate base station, the C-RNTI uniquely identifies the terminal on the cell of the subordinate base station, or competition random access preamble resources of the master base station and the subordinate base station are overlapped and non-competition random access preamble resources are staggered.

Specifically, the second processing module may also be specifically configured to:

configuring a resource for sending a random access preamble code to the terminal, and receiving the random access preamble code sent by the terminal on the cell of the subordinate base station according to the resource;

sending a random access response message to the terminal by using a Physical Downlink Control Channel (PDCCH) scrambled by a radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station sending the random access preamble, wherein the random access response message carries uplink transmission resources allocated for the terminal to perform uplink data transmission, the C-RNTI is detected by the subordinate base station from the cell sending the random access preamble, and the C-RNTI uniquely identifies the terminal on the subordinate base station;

alternatively, the second processing module 1102 may also be specifically configured to:

transmitting a PDCCH scrambled by using a random RA-RNTI on a primary cell of the subordinate base station; the RA-RNTI or the random access response message carries information of a cell sending the random access preamble, or TC-RNTI information carried in the random access response message is a C-RNTI value of the terminal on the cell of the subordinate base station, and the C-RNTI uniquely identifies the terminal on the cell of the subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered.

Based on the same technical concept, the embodiment of the present invention further provides a terminal and a base station, which can be applied to the above-mentioned scheme two, such as the implementation process of embodiment two, embodiment three, or embodiment four.

Referring to fig. 12, the terminal may include:

a first processing module 1201, configured to indicate, to a master base station, that the terminal has an uplink data transmission requirement on a slave base station when the terminal has the uplink data transmission requirement on the slave base station, so as to send the indication to the slave base station through the master base station.

Specifically, the first processing module 1201 may send uplink data transmission requirement indication information to the master base station, where the uplink data transmission requirement indication information is used to indicate that the terminal needs to perform uplink data transmission in the slave base station and request an uplink transmission resource. Specifically, the first processing module 1201 may send the uplink data transmission requirement indication information to the main control base station using L1 signaling, radio resource control RRC signaling, or buffer status report medium access control element BSR MAC CE, or a newly defined MAC CE. Further, the L1 signaling is a dedicated scheduling request message, and the resource of the dedicated scheduling request message is a resource pre-allocated by the master base station for the terminal and dedicated to the terminal to transmit uplink data transmission requirement indication information of a slave base station on the master base station.

Further, the uplink data transmission requirement indication information includes information of a cell of a subordinate base station, and the cell of the subordinate base station is a cell for which the terminal has an uplink data transmission requirement.

Further, the terminal may further include:

a second processing module 1202, configured to send a random access preamble in a cell of the slave base station according to a resource configured by the slave base station after the master base station sends the indication to the slave base station; the terminal detects a Physical Downlink Control Channel (PDCCH) scrambled by using a cell radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station which sends the random access preamble, acquires a random access response message according to the detected PDCCH, and acquires uplink transmission resources allocated for the terminal by the subordinate base station for uplink data transmission according to the random access response message, wherein the C-RNTI is detected by the subordinate base station from the cell which sends the random access preamble, and the C-RNTI uniquely identifies the terminal on the subordinate base station.

Alternatively, the second processing module 1102 may also send a random access preamble in the cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a PDCCH scrambled by using a random access radio network temporary identifier RA-RNTI on a master cell of a slave base station, and acquires a random access response message according to the detected PDCCH; and if the RA-RNTI or cell information carried in the random access response message or corresponding to the RA-RNTI is information of a cell sending the random access preamble, or TC-RNTI information carried in the random access response message is a value of C-RNTI of the terminal on a cell of the subordinate base station, wherein the C-RNTI uniquely identifies the terminal in the cell of the subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered, acquiring uplink transmission resources distributed for the terminal to perform uplink data transmission by the subordinate base station according to the random access response message.

Alternatively, the second processing module 1202 may also send a random access preamble in a cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a PDCCH scrambled by the main control base station by using RA-RNTI on a main cell of the main control base station, and acquires a random access response message according to the detected PDCCH; if the cell information carried in the RA-RNTI is the cell information for sending the random access preamble, or the TC-RNTI information carried in the random access response message is the value of the C-RNTI, or the competitive random access preamble resources of the master base station and the slave base stations are overlapped and the non-competitive random access preamble resources are staggered, acquiring the uplink transmission resources distributed by the slave base stations for the terminal to transmit the uplink data according to the random access response message; the random access response message is sent to the master base station by the slave base station, the terminal is uniquely identified by the C-RNTI on the cell of the slave base station, and the slave base station and the master base station configure the identification.

Referring to fig. 13, the base station may serve as a slave base station, and the slave base station may include:

a first processing module 1301, configured to receive an indication that the terminal forwarded by the master base station has an uplink data transmission requirement on the slave base station, where the indication is sent by the terminal when the terminal has an uplink data transmission requirement on the slave base station;

a second processing module 1302, configured to initiate a non-contention random access procedure to the terminal or allocate an uplink transmission resource for the terminal to perform the uplink data transmission according to the indication.

Specifically, the second processing module 1302 may initiate a non-contention random access procedure to the terminal according to the indication and the uplink synchronization state of the terminal, if it is determined that the cell between the terminal and the slave base station is in an out-of-synchronization state; and if the cell of the terminal and the cell of the subordinate base station are in a synchronous state, allocating uplink transmission resources for the terminal to perform uplink data transmission.

Specifically, when initiating the non-contention random access procedure to the terminal, the second processing module 1302 may configure a resource for sending a random access preamble to the terminal, and receive the random access preamble sent by the terminal on the cell of the slave base station according to the resource; sending a random access response message to the terminal by using a Physical Downlink Control Channel (PDCCH) scrambled by a radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station which sends the random access preamble, wherein the random access response message carries uplink transmission resources which are allocated for the terminal to carry out uplink data transmission; the C-RNTI is detected by the slave base station from a cell sending the random access preamble, and the C-RNTI uniquely identifies the terminal on the slave base station.

Alternatively, when the second processing module 1302 initiates a non-contention random access procedure to the terminal, it may also configure a resource for sending a random access preamble to the terminal, and receive the random access preamble sent by the terminal on the cell of the slave base station according to the resource; on a master cell of a slave base station which sends the random access lead code, sending a random access response message to the terminal by using a PDCCH scrambled by an RA-RNTI, wherein the random access response message carries uplink transmission resources allocated for the terminal to carry out uplink data transmission; the RA-RNTI carries information of a cell sending the random access preamble, or TC-RNTI information carried in the random access response message is unique identification information of the terminal on a subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered.

Referring to fig. 14, the base station may be a slave base station, and the slave base station may include:

a first processing module 1401, configured to receive an indication that the terminal forwarded by the master base station has an uplink data transmission requirement on the slave base station, where the indication is sent by the terminal when the terminal has an uplink data transmission requirement on the slave base station;

a second processing module 1402, configured to initiate a non-contention random access procedure to the terminal or allocate uplink transmission resources for the terminal to perform the uplink data transmission according to the indication.

Specifically, the second processing module 1402 may initiate a non-contention random access procedure to the terminal according to the indication and the uplink synchronization state of the terminal, if it is determined that the cell between the terminal and the slave base station is in an out-of-synchronization state; and if the cell of the terminal and the cell of the subordinate base station are in a synchronous state, allocating uplink transmission resources for the terminal to perform uplink data transmission.

Specifically, when initiating the non-contention random access procedure to the terminal, the second processing module 1402 may configure a resource for sending a random access preamble to the terminal, and receive the random access preamble sent by the terminal on the cell of the slave base station according to the resource; sending a random access response message to the terminal by using a Physical Downlink Control Channel (PDCCH) scrambled by a radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station which sends the random access preamble, wherein the random access response message carries uplink transmission resources which are allocated for the terminal to carry out uplink data transmission; the C-RNTI is detected by the slave base station from a cell sending the random access preamble, and the C-RNTI uniquely identifies the terminal on the slave base station.

Or, when initiating the non-contention random access procedure to the terminal, the second processing module 1402 may configure a resource for sending a random access preamble to the terminal, and receive the random access preamble sent by the terminal on the cell of the slave base station according to the resource; on a master cell of a slave base station which sends the random access lead code, sending a random access response message to the terminal by using a PDCCH scrambled by an RA-RNTI, wherein the random access response message carries uplink transmission resources allocated for the terminal to carry out uplink data transmission; the RA-RNTI carries information of a cell sending the random access preamble, or TC-RNTI information carried in the random access response message is unique identification information of the terminal on a subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An uplink scheduling request method, comprising:

when a terminal has an uplink data transmission requirement on a slave base station, the terminal indicates the terminal to a master base station that the terminal has the uplink data transmission requirement on the slave base station, so that the indication is sent to the slave base station through the master base station;

after the master base station sends the indication to the slave base station, the terminal further performs any one of the following steps:

step one, the terminal sends a random access lead code in a cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a Physical Downlink Control Channel (PDCCH) scrambled by using a cell radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station which sends the random access preamble, acquires a random access response message according to the detected PDCCH, and acquires uplink transmission resources allocated by the subordinate base station for the terminal for uplink data transmission according to the random access response message, wherein the C-RNTI is detected by the subordinate base station from the cell which sends the random access preamble, and the C-RNTI uniquely identifies the terminal on the subordinate base station;

step two, the terminal sends a random access lead code in a cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a PDCCH scrambled by using an RA-RNTI on a master cell of a slave base station, and acquires a random access response message according to the detected PDCCH; if the cell information carried in the RA-RNTI or the random access response message is the information of the cell sending the random access preamble, or the TC-RNTI information carried in the random access response message is the value of the C-RNTI of the terminal on the cell of the subordinate base station, the C-RNTI uniquely identifies the terminal in the cell of the subordinate base station, or the non-competitive random access preamble resources of different cells of the subordinate base station are staggered, the terminal acquires the uplink transmission resources allocated by the subordinate base station for the terminal to perform the uplink data transmission according to the random access response message;

step three, the terminal sends a random access lead code in the cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a PDCCH scrambled by the main control base station by using RA-RNTI on a main cell of the main control base station, and acquires a random access response message according to the detected PDCCH; if the cell information carried in the RA-RNTI is the information of the cell sending the random access preamble, or the TC-RNTI information carried in the random access response message is the value of the C-RNTI, or the competitive random access preamble resources of the master base station and the slave base station are overlapped and the non-competitive random access preamble resources are staggered, the terminal acquires the uplink transmission resources allocated by the slave base station for the terminal to perform the uplink data transmission according to the random access response message; the random access response message is sent to the master base station by the slave base station, the terminal is uniquely identified by the C-RNTI on the cell of the slave base station, and the slave base station and the master base station configure the identification.

2. The method of claim 1, wherein the terminal indicating to a master base station that the terminal has an uplink data transmission need at the slave base station comprises:

and the terminal sends uplink data transmission demand indication information to the master base station, wherein the uplink data transmission demand indication information is used for indicating that the terminal needs to carry out uplink data transmission on the slave base station and requests uplink transmission resources.

3. The method of claim 2, wherein the terminal sends the uplink data transmission requirement indication information to the master base station, and the method comprises:

and the terminal sends the uplink data transmission demand indication information to the main control base station by using L1 signaling or Radio Resource Control (RRC) signaling or buffer status report media access control (BSR) control unit (MAC CE) or newly defined MAC CE.

4. The method of claim 3, wherein the L1 signaling is a dedicated scheduling request message, and the resource of the dedicated scheduling request message is a resource pre-allocated by the master base station for the terminal, and dedicated to the terminal for transmitting uplink data transmission requirement indication information of a slave base station on the master base station.

5. The method of claim 2, wherein the uplink data transmission requirement indication information includes information of a cell of a subordinate base station, and the cell of the subordinate base station is a cell for which the terminal requests uplink transmission resources.

6. An uplink scheduling method, comprising:

the subordinate base station initiates a non-competitive random access process to the terminal or allocates uplink transmission resources for the terminal to perform the uplink data transmission according to the indication;

wherein the subordinate base station initiates a non-contention random access process to the terminal by any one of the following manners:

in a first way,

The subordinate base station configures resources for sending random access lead codes to the terminal and receives the random access lead codes sent by the terminal on the cell of the subordinate base station according to the resources;

the subordinate base station sends a random access response message to the terminal by using a Physical Downlink Control Channel (PDCCH) scrambled by a radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of the subordinate base station which sends the random access preamble, wherein the random access response message carries uplink transmission resources which are allocated for the terminal to carry out uplink data transmission; the C-RNTI is detected by the slave base station from a cell sending the random access preamble, and the C-RNTI uniquely identifies the terminal on the slave base station;

the second way,

the slave base station sends a random access response message to the terminal by using a PDCCH scrambled by an RA-RNTI on a master cell of the slave base station sending the random access preamble, wherein the random access response message carries uplink transmission resources allocated for the terminal to perform uplink data transmission; the information of the cell sending the random access preamble code carried in the RA-RNTI or the TC-RNTI information carried in the random access response message is the unique identification information of the terminal on the subordinate base station, or the non-competitive random access preamble code resources of different cells of the subordinate base station are staggered.

7. The method of claim 6, wherein the subordinate base station initiates a non-contention random access procedure to the terminal or allocates uplink transmission resources for the terminal to perform the uplink data transmission according to the indication, comprising:

the subordinate base station initiates a non-competitive random access process or to the terminal if judging that the cell between the terminal and the subordinate base station is in an out-of-step state according to the indication and the uplink synchronization state of the terminal; and if the cell of the terminal and the cell of the subordinate base station are in a synchronous state, allocating uplink transmission resources for the terminal to perform uplink data transmission.

8. An uplink scheduling method, comprising:

the master base station sends the indication to the slave base station;

after sending the indication to the slave base station, the master base station further performs the following processes:

the master base station receives a random access response message sent by the cell of the slave base station and information of the cell of the slave base station, wherein the random access response message carries uplink transmission resources allocated for the terminal to perform uplink data transmission;

and the master base station sends the random access response message to the terminal by using a physical downlink control channel PDCCH scrambled by a random access radio network temporary identifier RA-RNTI on a master cell of the master base station, wherein the RA-RNTI carries the cell information of the slave base station, or the TC-RNTI information carried in the random access response message is the C-RNTI of the terminal which is the unique identifier of the terminal on the cell of the slave base station, or the competitive random access lead code resources of the master base station and the slave base station are overlapped and the non-competitive random access lead code resources are staggered.

9. The method of claim 8, wherein the receiving, by the master base station, the indication from the terminal that there is a need for uplink data transmission at the slave base station comprises:

and the master base station receives uplink data transmission demand indication information sent by the terminal, wherein the uplink data transmission demand indication information is used for indicating that the terminal needs to perform uplink data transmission on the slave base station and request uplink transmission resources.

10. The method of claim 9, wherein the receiving, by the master base station, the uplink data transmission requirement indication information sent by the terminal comprises:

and the main control base station receives the uplink data transmission requirement indication information sent by the terminal to the main control base station by using L1 signaling or Radio Resource Control (RRC) signaling or buffer status report media access control unit (BSR) MAC CE or newly defined MAC CE.

11. A terminal, comprising:

the first processing module is used for indicating the terminal to have the uplink data transmission requirement on the slave base station to the master base station when the terminal has the uplink data transmission requirement on the slave base station, so that the indication is sent to the slave base station through the master base station;

a second processing module, configured to send a random access preamble in a cell of the slave base station according to a resource configured by the slave base station after the master base station sends the indication to the slave base station; the terminal detects a Physical Downlink Control Channel (PDCCH) scrambled by using a cell radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station which sends the random access preamble, acquires a random access response message according to the detected PDCCH, and acquires uplink transmission resources allocated by the subordinate base station for the terminal for uplink data transmission according to the random access response message, wherein the C-RNTI is detected by the subordinate base station from the cell which sends the random access preamble, and the C-RNTI uniquely identifies the terminal on the subordinate base station; or,

sending a random access preamble in a cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a PDCCH scrambled by using a random access radio network temporary identifier RA-RNTI on a master cell of a slave base station, and acquires a random access response message according to the detected PDCCH; if the RA-RNTI or cell information carried in the random access response message or corresponding to the RA-RNTI is information of a cell sending the random access preamble, or TC-RNTI information carried in the random access response message is a value of a C-RNTI of the terminal on a cell of the subordinate base station, wherein the C-RNTI uniquely identifies the terminal in the cell of the subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered, acquiring uplink transmission resources allocated by the subordinate base station for the terminal to perform uplink data transmission according to the random access response message; or,

sending a random access preamble in a cell of the subordinate base station according to the resource configured by the subordinate base station; the terminal detects a PDCCH scrambled by the main control base station by using RA-RNTI on a main cell of the main control base station, and acquires a random access response message according to the detected PDCCH; if the cell information carried in the RA-RNTI is the cell information for sending the random access preamble, or the TC-RNTI information carried in the random access response message is the value of the C-RNTI, or the competitive random access preamble resources of the master base station and the slave base stations are overlapped and the non-competitive random access preamble resources are staggered, acquiring the uplink transmission resources distributed by the slave base stations for the terminal to transmit the uplink data according to the random access response message; the random access response message is sent to the master base station by the slave base station, the terminal is uniquely identified by the C-RNTI on the cell of the slave base station, and the slave base station and the master base station configure the identification.

12. The terminal of claim 11, wherein the first processing module is specifically configured to send uplink data transmission requirement indication information to a master base station, where the uplink data transmission requirement indication information is used to indicate that the terminal needs to perform uplink data transmission at the slave base station and request an uplink transmission resource.

13. The terminal of claim 12, wherein the first processing module is specifically configured to send the uplink data transmission requirement indication information to a master base station using L1 signaling, or radio resource control RRC signaling, or buffer status report medium access control element BSR MAC CE, or a newly defined MAC CE.

14. The terminal of claim 13, wherein the L1 signaling is a dedicated scheduling request message, and the resource of the dedicated scheduling request message is a resource pre-allocated by the master base station for the terminal, and dedicated to the terminal for transmitting uplink data transmission requirement indication information of a slave base station on the master base station.

15. The terminal of claim 12, wherein the uplink data transmission requirement indication information includes information of a cell of a subordinate base station, and the cell of the subordinate base station is a cell for which the terminal has an uplink data transmission requirement.

16. A base station, wherein the base station is a slave base station, and wherein the slave base station comprises:

a second processing module, configured to initiate a non-contention random access procedure to the terminal or allocate uplink transmission resources for the terminal to perform the uplink data transmission according to the indication; wherein, the method further comprises initiating a non-contention random access procedure to the terminal by any one of:

in a first way,

sending a random access response message to the terminal by using a Physical Downlink Control Channel (PDCCH) scrambled by a radio network temporary identifier (C-RNTI) or a random access radio network temporary identifier (RA-RNTI) on a cell of a subordinate base station which sends the random access preamble, wherein the random access response message carries uplink transmission resources which are allocated for the terminal to carry out uplink data transmission; the C-RNTI is detected by the slave base station from a cell sending the random access preamble, and the C-RNTI uniquely identifies the terminal on the slave base station;

the second way,

on a master cell of a slave base station which sends the random access lead code, sending a random access response message to the terminal by using a PDCCH scrambled by an RA-RNTI, wherein the random access response message carries uplink transmission resources allocated for the terminal to carry out uplink data transmission; the RA-RNTI carries information of a cell sending the random access preamble, or TC-RNTI information carried in the random access response message is unique identification information of the terminal on a subordinate base station, or non-competitive random access preamble resources of different cells of the subordinate base station are staggered.

17. The base station of claim 16, wherein the second processing module is specifically configured to, according to the indication and the uplink synchronization state of the terminal, initiate a non-contention random access procedure or to the terminal if it is determined that the cell between the terminal and the slave base station is in an out-of-synchronization state; and if the cell of the terminal and the cell of the subordinate base station are in a synchronous state, allocating uplink transmission resources for the terminal to perform uplink data transmission.

18. A base station, wherein the base station is a master base station, the master base station comprising:

the receiving module is used for receiving an indication that the terminal has an uplink data transmission requirement on the subordinate base station, wherein the indication is sent by the terminal when the terminal has the uplink data transmission requirement on the subordinate base station; and a first forwarding module, configured to receive a random access response message sent by a cell of the subordinate base station and information of the cell of the subordinate base station after sending the indication to the subordinate base station, where the random access response message carries an uplink transmission resource allocated for the terminal to perform the uplink data transmission;

a first transmitting module, configured to transmit the indication to the subordinate base station;

and the second forwarding module is used for sending the random access response message to the terminal by using a physical downlink control channel PDCCH scrambled by a random access radio network temporary identifier RA-RNTI on the master cell of the master base station, wherein the RA-RNTI carries the cell information of the slave base station, or the TC-RNTI information carried in the random access response message is the C-RNTI of the terminal which is the only identifier of the terminal on the cell of the slave base station, or the competitive random access preamble resources of different cells of the master base station and the slave base station are overlapped and the non-competitive random access preamble resources are staggered.

19. The base station of claim 18, wherein the receiving module is specifically configured to receive uplink data transmission requirement indication information sent by the terminal, where the uplink data transmission requirement indication information is used to indicate that the terminal needs to perform uplink data transmission at the slave base station and request an uplink transmission resource.

20. The base station of claim 19, wherein the receiving module is specifically configured to receive the terminal using L1 signaling or radio resource control RRC signaling or buffer status report media access control element BSR MAC CE or a newly defined MAC CE, and send the uplink data transmission requirement indication information to the master base station.