CN101932111A

CN101932111A - Method and system for resource scheduling between enhanced base stations

Info

Publication number: CN101932111A
Application number: CN2009100883314A
Authority: CN
Inventors: 王冠宙; 张银成; 张健
Original assignee: ZTE Corp
Current assignee: Nch 93 LLC
Priority date: 2009-06-26
Filing date: 2009-06-26
Publication date: 2010-12-29
Anticipated expiration: 2029-06-26
Also published as: CN101932111B

Abstract

The invention discloses a method for resource scheduling between enhanced base stations, comprising: configuring resource in a resource reservation queue and time corresponding to the resource; a service enhanced base station (eNB) notifies the resource and the time corresponding to the resource to a non-service eNB; the service eNB and the non-service eNB jointly send or jointly receive data on the resource according to the time corresponding to the resource. The invention also discloses a system for resource scheduling between enhanced base stations. In the system, a configuration unit is used for configuring the resource in the resource reservation queue and the time corresponding to the resource; and a notification unit is used for the service eNB to notify the configured resource and time corresponding to the resource to the non-service eNB. The method and the system of the invention not only can avoid multiple transmitting scheduling information frequently between the service eNB and the non-service eNB while realizing resource scheduling, but also can satisfy the time sequence requirement of retransmitting mixed automatic requests.

Description

Method and system for scheduling resources between enhanced base stations

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for scheduling resources between enhanced base stations (enbs).

Background

In an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) of a Long Term Evolution (LTE) system for third generation mobile communication, uplink/downlink data is transmitted through uplink/downlink shared channels. Resources are allocated to each User Equipment (UE) by the eNB. The access technology adopted by the E-UTRAN is Orthogonal Frequency Division Multiplexing (OFDM) technology, and compared with a second generation mobile communication system, the radio resource management of the E-UTRAN system has the characteristics of large bandwidth and multiple time processes, and the radio resource of the E-UTRAN system appears in two dimensions of time and frequency, so that the number of users which can be carried is greatly increased.

In an LTE system, an eNB generally allocates uplink and downlink air interface resources to a UE in a dynamic scheduling manner. When Downlink data needs to be sent, the eNB sends Downlink resource Assignment (DL Assignment) signaling up and down on a Physical Downlink Control Channel (PDCCH), where the signaling carries air interface resource mapping information, modulation and coding information, and the like of Downlink data transmission; when the UE detects that there is a DL Assignment on the PDCCH, it receives downlink data on a Physical Downlink Shared CHannel (PDSCH) of the same subframe (subframe). When the UE has Uplink data to send, the UE sends a resource scheduling request on a Physical Uplink Control CHannel (PUCCH) to apply for an air interface resource required for sending the Uplink data to the eNB. An eNB (evolved node B) transmits an Uplink transmission Grant (UL Grant) signaling on a PDCCH (physical downlink control channel), and the signaling carries air interface resource mapping information, modulation and coding information and the like of Uplink data transmission; when the UE detects that there is a UL Grant belonging to the UE on the PDCCH, the UE transmits uplink data on a Physical Uplink Shared CHannel (PUSCH) of a 4 th subframe (n +3) after the subframe n. The dynamic scheduling method is characterized in that each time Uplink (UL) data transmission or Downlink (DL) data reception of the UE requires the eNB to explicitly assign resources on the PDCCH through a scheduling instruction, i.e., UL Grant or DL Assignment.

For some services, data transceiving has a characteristic of obvious periodicity, for example, voice data packets of a voice over IP (VoIP) service are one every 20 ms. In this case, it is not necessary to dynamically assign air interface resources to each packet, and a Semi-Persistent Scheduling (SPS) approach may be used. The eNB reserves a certain air interface resource for the UE receiving the service, and informs the UE in a DLAssignment or UL Grant mode on the PDCCH when receiving and transmitting the first data packet. The SPS mode uses different MAC layer identifications different from a dynamic scheduling mode, wherein the dynamic scheduling mode uses C-RNTI for indication; the SPS mode is indicated by using the SPS-RNTI, so the UE can distinguish whether the resource scheduling is the dynamic scheduling mode or the SPS mode. In the subsequent data packet transceiving, the UE does not need to receive a corresponding resource scheduling instruction on the PDCCH, but automatically performs data transceiving on the same resource according to a pre-configured SPS period. The SPS approach reduces the overhead due to frequent transmission of resource scheduling signaling on the PDCCH.

For a UE located at the edge of eNB coverage, radio signals from several nearby neighboring base stations may be received simultaneously, and the radio signals transmitted by the UE may also be received by multiple nearby base stations. In this case, a plurality of base stations may be Coordinated to simultaneously perform joint reception and transmission of uplink and downlink data for the UE, which is a so-called Coordinated multipoint processing (CoMP) technique. By utilizing CoMP and related signal processing technology, gains of data diversity and spatial multiplexing can be achieved for uplink and downlink wireless signals, and the reliability of wireless data transmission and data throughput are improved.

The neighboring cells participating in CoMP coordination may belong to the same eNB control or may belong to different enbs. When CoMP cooperation occurs between different enbs, the UE only receives uplink and downlink resource scheduling instructions on the PDCCH of one of the enbs, and only uploads Hybrid Automatic Repeat reQuest (HARQ) feedback information and other measurement report information to the same eNB. This eNB is called the serving eNB, the others are non-serving enbs. In a scenario where multiple enbs participate in CoMP coordination, in order to achieve the purpose of joint transmission and reception of uplink and downlink data, the serving eNB needs to send a resource scheduling instruction to the non-serving eNB through an inter-eNB X2 interface, so that the non-serving eNB can transmit/receive data to/from the UE on the same time and frequency resources as the serving eNB. As shown in fig. 1.

In a scenario where multiple enbs participate in CoMP coordination, if a dynamic scheduling manner is completely adopted, the serving eNB must notify corresponding resource scheduling information to the non-serving eNB before data transmission, corresponding to each uplink and downlink data transmission. Considering that the Transmission Time Interval (TTI) is only 1ms, the dynamic scheduling command may be issued very frequently, i.e. the scheduling information is also communicated frequently between the serving eNB and the non-serving eNB. In addition, the existing HARQ has strict timing requirements for scheduling instruction issuing, data transmission, HARQ feedback, data retransmission and other actions. For example, requiring HARQ feedback to be sent 4ms after UL or DL data transmission. When CoMP coordination occurs among multiple enbs, a large amount of scheduling information and data need to be transmitted through the X2 interface between the enbs, and transmission delay and related processing delay of the X2 interface will cause great difficulty in maintaining the HARQ timing requirement, or even fail to meet the HARQ timing requirement.

In summary, in a scenario where multiple enbs participate in CoMP coordination, the existing dynamic scheduling method is completely adopted, which has two disadvantages, on one hand: scheduling information needs to be frequently transmitted between a serving eNB and a non-serving eNB many times; on the other hand: the delay caused by transmitting the scheduling information for many times is not beneficial to maintaining or even failing to meet the timing requirement of the HARQ. At present, no effective resource scheduling scheme exists, which can avoid the above two disadvantages.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a method and a system for scheduling resources between enbs, which not only can avoid frequent multiple transmissions of scheduling information between a serving eNB and a non-serving eNB while achieving resource scheduling, but also can meet the timing requirement of HARQ.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for resource scheduling between enhanced base stations, the method comprising:

configuring resources in the resource reservation queue and time corresponding to the resources;

a serving enhanced base station (eNB) notifying a non-serving eNB of the configured resource and a time corresponding to the resource;

and the service eNB and the non-service eNB simultaneously jointly transmit or jointly receive data on the resources according to the time corresponding to the resources.

When a dynamic scheduling mode is adopted, the service eNB informs the non-service eNB through an X2 interface scheduling message; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of 1 or more;

under the condition of downlink data transmission, the service eNB and the non-service eNB jointly transmit downlink data on Ri at the same time at the moment of Ti; or, in the case of uplink data reception, the serving eNB and the non-serving eNB jointly receive uplink data on Ri at the same time at Ti +4 ms.

Under the condition of downlink data transmission, before jointly transmitting downlink data on Ri, the method further includes:

the service eNB sends a downlink resource assignment signaling to User Equipment (UE) at the moment Ti; wherein, the resource appointed by the downlink resource assignment signaling is the Ri;

after the downlink data is jointly transmitted on the Ri, the method further includes:

after the UE detects the downlink resource assignment signaling, the UE receives, combines and decodes the data jointly transmitted by the service eNB and the non-service eNB on the Ri at the moment Ti;

and after the data decoding is successful, the UE feeds back a successful response or a failed response of the hybrid automatic repeat request HARQ to the service eNB at the time of Ti +4 ms.

Under the condition of uplink data reception, before jointly receiving uplink data on Ri, the method further includes:

the service eNB sends an uplink transmission permission signaling to the UE at the moment Ti; wherein, the resource designated by the uplink transmission permission signaling is the Ri;

after the UE detects the uplink transmission permission signaling, the UE sends uplink data on the Ri at the moment of Ti +4 ms;

after jointly receiving the uplink data on Ri, the method further includes:

the non-service eNB forwards the received uplink data to the service eNB; and after the service eNB successfully combines and decodes the received uplink data, feeding back a successful response or a failed response of the HARQ to the UE at the time of Ti +8 ms.

Wherein, when a semi-persistent scheduling (SPS) mode is adopted, the eNB informs the non-service eNB through an X2 interface scheduling message; wherein, the X2 interface scheduling message includes: the same resources R, the initial time T1 corresponding to the initial resources and the semi-persistent scheduling Period SPS _ Period are configured in the resource reservation queue;

in the case of downlink data transmission, in an initial state, the serving eNB and the non-serving eNB jointly transmit downlink data on the R at the same time at time T1; each time one SPS _ Period state is reached, the service eNB and the non-service eNB jointly transmit downlink data on the R at the time T1+ SPS _ Period;

or, in the case of uplink data reception, in an initial state, the serving eNB and the non-serving eNB jointly receive uplink data on the R at the time T1+4 ms; and when each SPS _ Period state is reached, the service eNB and the non-service eNB jointly transmit downlink data on the R at the time T1+ SPS _ Period.

Under the condition of sending downlink data, in an initial state, before jointly sending the downlink data on R, the method further comprises the following steps:

at time T1, the serving eNB issues a downlink resource assignment signaling to the UE; wherein, the resource appointed by the downlink resource assignment signaling is the R;

after jointly transmitting downlink data on R, the method further comprises the following steps:

after the UE detects the downlink resource assignment signaling, at time T1, the UE receives, combines, and decodes data jointly transmitted by the serving eNB and the non-serving eNB on the R;

after the data decoding is successful, the UE feeds back a successful response or a failed response of the HARQ to the serving eNB at time T1+4 ms.

Under the condition of uplink data receiving, in an initial state, before jointly receiving uplink data on R, the method further comprises the following steps:

at time T1, the serving eNB issues an uplink transmission permission signaling to the UE; wherein, the resource designated by the uplink transmission permission signaling is the R;

after the UE detects the uplink transmission permission signaling, at a time T1+4ms, the UE sends uplink data on the R;

after jointly receiving the uplink data on R, the method further comprises the following steps:

the non-service eNB forwards the received uplink data to the service eNB; and after the service eNB successfully combines and decodes the received uplink data, the service eNB feeds back a successful response or a failed response of the HARQ to the UE at the time of T1+8 ms.

A system for scheduling resources between enhanced base stations, the system comprising: a configuration unit, a notification unit, and a transmission unit/reception unit; wherein,

a configuration unit, configured to configure resources in the resource reservation queue and a time corresponding to the resources;

a notification unit configured to notify the non-serving eNB of the configured resource and a time corresponding to the resource by the serving eNB;

a sending unit, configured to simultaneously and jointly send data on the resources according to the time corresponding to the resources by the serving eNB and the non-serving eNB; or, a receiving unit, configured to jointly receive data on the resource simultaneously by the serving eNB and the non-serving eNB according to a time corresponding to the resource.

The notification unit is further configured to notify, by the serving eNB, the non-serving eNB through an X2 interface scheduling message in a dynamic scheduling mode; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of 1 or more;

the sending unit is further configured to jointly send downlink data on Ri simultaneously at the time Ti by the serving eNB and the non-serving eNB.

a receiving unit, further configured to jointly receive uplink data on Ri simultaneously at the time Ti +4ms by the serving eNB and the non-serving eNB.

Wherein, the notification unit is further configured to notify, by the eNB, the non-serving eNB through an X2 interface scheduling message in an SPS mode state; wherein, the X2 interface scheduling message includes: the same resources R, the initial time T1 corresponding to the initial resources and SPS _ Period are configured in the resource reservation queue;

the sending unit is further configured to, in an initial state, jointly send downlink data on the R at the same time by the serving eNB and the non-serving eNB at time T1; and each time an SPS _ Period state is reached, jointly transmitting downlink data on the Ri at the T1+ SPS _ Period time by the serving eNB and the non-serving eNB.

the receiving unit is further configured to, in an initial state, jointly receive uplink data on the R at a time T1+4ms by the serving eNB and the non-serving eNB; and each time an SPS _ Period state is reached, jointly transmitting downlink data on the Ri at the T1+ SPS _ Period time by the serving eNB and the non-serving eNB.

The invention configures the resources in the resource reservation queue and the time corresponding to the resources; the service eNB informs the non-service eNB of the configured resources and the time corresponding to the resources; and the service eNB and the non-service eNB simultaneously transmit or receive data jointly on the resources according to the time corresponding to the resources.

The invention ensures compatibility by changing the realization technology of resource scheduling without changing the prior HARQ mechanism, namely: the method comprises the steps that a service eNB and a non-service eNB firstly reserve a time when data are to be transmitted or received and a resource corresponding to the time in advance in a notification mode, wherein the resource is a resource position for transmitting the data; and then, the service eNB and the non-service eNB simultaneously transmit or receive data on the resources jointly according to the time corresponding to the resources, so that the influence of time delay caused by multiple times of transmission of scheduling information on CoMP data transmission is reduced. The resource scheduling scheme of the invention has the advantages of two aspects, one is that: the method can reduce the need of frequently transmitting scheduling information between the service eNB and the non-service eNB in the situation that the multiple eNBs cooperate with the CoMP, and can ensure that the service eNB and the non-service eNB can carry out effective data joint transmission under the resource scheduling scheme, thereby realizing the gain brought by the CoMP; on the other hand, the strict requirement of the HARQ timing on the transmission delay of X2 can be effectively relieved through the resource scheduling scheme, so that the timing requirement of the existing HARQ mechanism can be met even under the condition of larger X2 time delay.

Drawings

Fig. 1 is a schematic diagram of a network structure for performing joint processing of multiple enbs by using CoMP technology;

FIG. 2 is a diagram illustrating resource scheduling and data transmission between eNBs using a resource reservation queue;

FIG. 3 is a schematic flow chart illustrating an implementation of a method embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating the implementation of another embodiment of the method of the present invention;

fig. 5 is a schematic flow chart of an implementation of another embodiment of the method of the present invention.

Detailed Description

The basic idea of the invention is: and the service eNB and the non-service eNB simultaneously jointly transmit or jointly receive data on the resources according to the resources agreed in advance and the time corresponding to the resources.

The following describes the embodiments in further detail with reference to the accompanying drawings.

A method for resource scheduling between eNBs, the method comprising:

step 101, configuring resources in the resource reservation queue and time corresponding to the resources.

Here, the resource reservation queue generally includes a plurality of resources, a first resource may be referred to as an initial resource, and a time corresponding to the initial resource may be referred to as an initial time.

Step 102, the serving eNB notifies the non-serving eNB of the configured resources and the time corresponding to the resources.

Here, the specific processing procedure after step 102 is different when data is transmitted or received, and is described below.

When transmitting data, step 102 further includes:

step 1031, serving eNB and non-serving eNB simultaneously transmit data jointly on the resources according to the time corresponding to the resources.

When receiving data, step 102 further includes:

and step 1032, the serving eNB and the non-serving eNB simultaneously receive data jointly on the resources according to the time corresponding to the resources.

Here, the method further includes: the resources used for sending or receiving data at different time are in the same frequency domain or different frequency domains.

For the above technical solutions formed by steps 101 to 1031 or steps 101 to 1032, when the dynamic scheduling method or the SPS method is adopted, the specific processing procedures of the two technical solutions are different, and the technical solutions formed by steps 101 to 1031 are for the case of downlink data transmission; the technical solutions of step 101 to step 1032 are described below for the case of uplink data reception.

In the first case: when the dynamic scheduling method is adopted, in the technical solution constituted by steps 101 to 1031, in step 102, the serving eNB further notifies the non-serving eNB of the allocated resources and the time corresponding to the resources through an X2 interface scheduling message.

Wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue, and a time Ti corresponding to each resource. i is an integer of > ═ 1, and when i is 1, R1 denotes an initial resource in the resource reservation queue, and T1 denotes an initial time corresponding to the initial resource R1.

In step 1031, the serving eNB and the non-serving eNB further jointly transmit downlink data on Ri at the same time at time Ti.

Here, before jointly transmitting downlink data on Ri, the method further includes: the service eNB issues the DLAssignment signaling to the UE at the moment Ti; wherein, the resource designated by the DL Assignment signaling is Ri.

Here, after jointly transmitting downlink data on Ri, the method further includes: and after the UE detects the DL Assignment signaling, the UE receives the data jointly transmitted by the service eNB and the non-service eNB on Ri at the moment Ti and combines and decodes the data. After the data decoding is successful, the UE feeds back a success (ACK) response or a failure (NACK) response of the HARQ to the serving eNB at time Ti +4 ms.

In the second case: in the case of the dynamic scheduling scheme, in the technical solution including steps 101 to 1032, in step 102, the serving eNB further notifies the non-serving eNB of the allocated resources and the time corresponding to the resources through an X2 interface scheduling message.

In step 1032, the serving eNB and the non-serving eNB further jointly receive uplink data on Ri at time Ti +4 ms.

Here, before jointly receiving the upstream data on Ri, the method further includes: the service eNB issues the ULGrant signaling to the UE at the moment Ti; wherein, the resource designated by the UL Grant signaling is Ri. And after the UE detects the UL Grant signaling, the UE transmits uplink data on Ri at the moment of Ti +4 ms.

Here, jointly receiving the upstream data on Ri further includes: the non-serving eNB forwards the received uplink data to the serving eNB. And after the service eNB successfully merges and decodes the received uplink data, the service eNB feeds back an ACK response or a NACK response of the HARQ to the UE at the time of Ti +8 ms.

In the third case: in the case of the SPS method, in the above technical solution including steps 101 to 1031, the serving eNB further notifies the non-serving eNB of the allocated resources and the time corresponding to the resources through an X2 interface scheduling message in step 102.

Wherein, the X2 interface scheduling message includes: each identical resource R configured in the resource reservation queue, an initial time T1 corresponding to the initial resource, and a semi-persistent scheduling Period (SPS _ Period).

In step 1031, in the initial state, the serving eNB and the non-serving eNB further jointly transmit downlink data at time T1 on R at the same time.

In step 1031, every time an SPS _ Period status is reached, the serving eNB and the non-serving eNB further jointly transmit downlink data on R at time T1+ SPS _ Period.

For the above initial state, before jointly transmitting downlink data on R in the initial state, the method further includes: at the time of T1, the service eNB issues the DL Assignment signaling to the UE; wherein the resource designated by the DL Assignment signaling is R.

In the initial state, after the downlink data is jointly sent on the R, the method further comprises the following steps: after detecting the DLAssignment signaling, at time T1, the UE receives, merges, and decodes the data jointly transmitted by the serving eNB and the non-serving eNB on R. After the data decoding is successful, the UE feeds back an ACK response or a NACK response of the HARQ to the serving eNB at time T1+4 ms.

In a fourth case: in the case of the SPS method, in the technical solution including steps 101 to 1032, in step 102, the serving eNB further notifies the non-serving eNB of the allocated resources and the time corresponding to the resources through an X2 interface scheduling message.

Wherein, the X2 interface scheduling message includes: each identical resource R configured in the resource reservation queue, an initial time T1 corresponding to the initial resource, and SPS _ Period.

In step 1032, in the initial state, the serving eNB and the non-serving eNB further jointly receive uplink data on R at time T1+4 ms.

In step 1032, each time an SPS _ Period status is reached, the serving eNB and the non-serving eNB jointly transmit downlink data at time T1+ SPS _ Period, and at the same time, at R.

For the above initial state, the method further includes, before jointly receiving uplink data on R in the initial state: the service eNB issues the UL Grant signaling to the UE at the time of T1; wherein, the resource designated by the UL Grant signaling is R. After detecting the UL Grant signaling, the UE sends uplink data on R at time T1+4 ms.

The method also comprises the following steps after the uplink data are jointly received on the R in the initial state: the non-serving eNB forwards the received uplink data to the serving eNB. And after the service eNB successfully merges and decodes the received uplink data, feeding back an ACK response or a NACK response of the HARQ to the UE at the time of T1+8 ms.

Fig. 2 is a schematic diagram of fig. 2 illustrating resource scheduling and data transmission between enbs by using a resource reservation queue, where in fig. 2, hatching and filling of left slashes indicate that: reserving resource positions in the resource queue; the shading of the right slash indicates: transmitting a resource position adopted by the DL Assignment signaling on a PDCCH of a serving eNB; the shaded fill of the cross-hatching indicates: resource locations employed for transmitting downlink Data (DL Data) on the PDSCH of a serving eNB or a non-serving eNB; t1 to T4 each indicate a time corresponding to each resource location; the TTI is 1 ms.

In summary, the present invention mainly includes the following contents: the serving eNB reserves certain downlink resources for downlink data that may arrive in a future time period, and these resources may be continuous in time or distributed at certain intervals. The time intervals may be the same, i.e. periodic; or may be different, i.e. aperiodic. The positions of the Physical Resource Blocks (PRBs) of the reserved resources at different times in the frequency domain may be the same or different. These reserved resources generally use the same Modulation and Coding Scheme (MCS). These resource blocks reserved at different times form a reserved resource queue.

The serving eNB sends the resource reservation information in these periods of time to the non-serving eNB, and notifies the non-serving eNB of the time T1 for the first downlink data transmission. The T1 is uniquely determined by the combination of the system frame number SFN and the subframe offset n, and the serving eNB will consider the delay of the transmission of scheduling information and data on the X2 interface and the processing delay of the non-serving eNB when calculating the selection T1, thereby ensuring that both the serving eNB and the non-serving eNB are ready to transmit downlink data at time T1.

At time T1, the serving eNB starts to send DLAssignment signaling to the UE on the downlink control channel PDCCH, so as to assign the used resource as the first resource block in the reserved resource queue. The service eNB and the non-service eNB simultaneously transmit downlink data to the UE on the same reserved resource in the TTI corresponding to the T1 moment; when the time T2 corresponding to the next reserved resource block arrives, the serving eNB also starts to send a DL Assignment signaling to the UE on the PDCCH, so as to assign the used resource as the second resource block in the reserved resource queue. The serving eNB and the non-serving eNB simultaneously send downlink data to the UE on the same reserved resource corresponding to the T2 time; this continues until all resources in the reserved resource queue have been exhausted or there is no new data in the buffer queue. The above process is shown in fig. 2.

The time interval between each reserved resource in the resource reservation queue can be 0, and the reserved resources are continuous in time; the time intervals may be the same, when the reserved resources are periodic in time.

The reservation resources are periodic in time and the location in the frequency domain and the MCS used are the same, when the scheduling is similar to the SPS approach. The serving eNB may notify the UE of the configuration information of the SPS, i.e., SPS _ Period, through RRC signaling. Thus, the serving eNB only needs to issue DL Assignment signaling on the PDCCH at time T1, where the DL Assignment signaling uses SPS-RNTI as the UE identity, and can directly transmit downlink data on the PDSCH fixed resource at the subsequent SPS _ Period time, and the UE will automatically receive the downlink data on the appointed resource according to SPS _ Period. Similarly, the serving eNB only needs to notify the serving non-serving eNB of the corresponding SPS configuration information, i.e., SPS _ Period, in the X2 scheduling information, and the non-serving eNB transmits downlink data simultaneously with the serving eNB on the agreed resources according to the SPS _ Period.

If the decoding of certain downlink data fails and needs to be retransmitted, the serving eNB uses dynamic scheduling to allocate new downlink retransmission resources, and the retransmission does not affect the serving eNB and the non-serving eNB to send data according to the reserved resource queue. The non-serving eNB may or may not participate in joint transmission of retransmission data. When the serving eNB needs the non-serving eNB to participate in the retransmission, the scheduling information related to the retransmission is sent to the non-serving eNB through an X2 interface, and the serving eNB and the non-serving eNB finish the transmission of retransmission data together at the appointed time and resources.

It should be noted that the above scheduling method is also applicable to uplink data transmission, except that the data transmission time is 4ms later than the UL Grant reception time according to the HARQ timing requirement in uplink data transmission, and the other processes are the same.

It can be seen that: by adopting the invention, the resource reservation queue is applied between the service eNB and the non-service eNB, the frequent transmission of resource scheduling information between the eNBs under the CoMP scene can be effectively reduced, and meanwhile, the difficulty brought by X2 transmission and related processing time delay to cross-eNB scheduling and data transmission can be effectively relieved by using larger time interval between reserved resources.

The first embodiment of the method comprises the following steps: as shown in fig. 3, this embodiment illustrates how to apply the present invention to perform continuous downlink data joint transmission between a serving eNB and a non-serving eNB, including the following steps:

step 101, when the serving eNB has downlink data to arrive, the data is buffered. The serving eNB reserves resources of 4 TTIs for the existing downlink data and downlink data that may be received in the future, and at times T1, T2, T3, and T4, respectively, the corresponding reserved PRB resources may be the same or may be in different locations. The service eNB informs the non-service eNB of the resource reservation queue through an X2 interface scheduling message; the starting time T1 is precisely specified by a System Frame Number (SFN) plus a subframe offset (subframe), and the rest of T2, T3 and T4 may be specified by TTI intervals for reference of T1.

Here, the X2 interface schedule message includes: UE identification, a resource reservation queue and a scheduling time consisting of time T1 to time T4. The time T1, the time T2, the time T3, and the time T4 correspond to resource 1, resource 2, resource 3, and resource 4 reserved in the resource reservation queue, respectively, and resources 1 to 4 may also be represented by R1 to R4.

Step 102, at time T1, the serving eNB issues a DL Assignment signaling on the PDCCH, where the specified resource is reserved resource 1.

Here, the DL Assignment signaling includes: resource 1 related information.

Step 103, at time T1, the serving eNB and the non-serving eNB jointly transmit downlink data on the agreed resource 1 at the same time, and the UE detects the DL Assignment signaling on the PDCCH, and then receives, combines, and decodes the data transmitted by the serving eNB and the non-serving eNB on the resource 1.

Here, data transmitted to the UE by the serving eNB and the non-serving eNB are denoted by DL data1 and DL data2, respectively.

And step 104, the data decoding is successful, and the UE sends HARQ ACK response or NACK response to the service eNB at the time T1+4 ms.

Step 105, at time T2, the serving eNB issues a DL Assignment signaling on the PDCCH, where the specified resource is reserved resource 2.

Here, the DL Assignment signaling includes: resource 2 related information.

Step 106, at time T2, the serving eNB and the non-serving eNB jointly transmit downlink data on the agreed resource 2 at the same time, and the UE receives, combines, and decodes the data transmitted by the serving eNB and the non-serving eNB on the resource 2 after detecting the DL Assignment signaling on the PDCCH. Thereafter, the above scheduling and data transmission processes are repeated at time T3, T4.

Step 107, if the reserved resources are all scheduled and used, and data still remain to be sent in the buffer, the serving eNB constructs a new resource reservation queue and notifies the non-serving eNB to start a new round of data transmission.

Here, the X2 interface schedule message includes: UE identification, a resource reservation queue and a scheduling time consisting of time T5 to time T7. The time T5, the time T6, and the time T7 respectively correspond to the resource 5, the resource 6, and the resource 7 reserved in the resource reservation queue, and the resource 5, the resource 6, and the resource 7 may also be represented by R5 to R7. Also, the start time T5 of the new resource reservation queue constructed is also precisely specified in SFN + subframe manner, and the rest of T6 and T7 may be specified in TTI interval manner with reference to T1.

The second method embodiment: as shown in fig. 4, this embodiment illustrates how to apply the present invention to perform continuous uplink data joint reception between a serving eNB and a non-serving eNB.

Step 201, when the UE has uplink data to send. The serving eNB reserves resources of 4 TTIs for the existing uplink data that may be transmitted in the future, and at times T1, T2, T3, and T4, respectively, the corresponding reserved PRB resources may be the same or may be in different locations. The service eNB informs the non-service eNB of the resource reservation queue through an X2 interface scheduling message; the starting time T1 is precisely specified as SFN + subframe, and the rest of T2, T3 and T4 may be specified as TTI intervals with reference to T1.

Step 202, at time T1, the serving eNB issues an UL Grant signaling on the PDCCH, where the specified resource is reserved resource 1.

Here, the UL Grant signaling includes: resource 1 related information.

Step 203, at the time of T1+4ms, the UE starts sending uplink data on the specified resource; the serving eNB and the non-serving eNB jointly receive uplink data on the appointed resource 1 at the same time.

Here, data transmitted to the UE by the serving eNB and the non-serving eNB are denoted by UL data1 and UL data2, respectively.

And step 204, the non-service eNB forwards the received uplink data to the service eNB.

Step 205, after the serving eNB successfully combines and decodes the received uplink data, the serving eNB sends an ACK response or a NACK response of HARQ to the UE at a time T1+8 ms.

Step 206, at time T2, the serving eNB issues an UL Grant signaling on the PDCCH, where the specified resource is reserved resource 2.

Here, the UL Grant signaling includes: resource 2 related information.

Step 207, at the time of T2+4ms, the UE starts sending uplink data on the designated resource; the serving eNB and the non-serving eNB jointly receive uplink data on the appointed resource 2 at the same time. Thereafter, the above scheduling and data transmission processes are repeated at time T3, T4.

And step 208, if the reserved resources are completely scheduled and used, the UE still has an uplink data transmission request, the serving eNB constructs a new resource reservation queue and informs the non-serving eNB to start a new round of data transmission.

The third method embodiment: as shown in fig. 5, this embodiment illustrates that if the reserved resources have a certain periodicity and use the same resources and MCS, SPS scheduling may be used between the serving eNB and the non-serving eNB.

Step 301, when the serving eNB has downlink data to arrive, the data is buffered. The serving eNB decides to reserve periodic resources and performs scheduling in an SPS manner. The serving eNB sends a scheduling message to the non-serving eNB through an X2 interface, wherein the scheduling message carries the following information: the time T1 of the first data transmission is represented by SFN + subframe combination, air interface resource information, SPS _ Period, UE identity, etc.

Step 302, at the time T1 ═ SFN + subframe, the serving eNB sends DLAssignment signaling on the PDCCH; the signaling will use SPS-RNTI as the identity so that the UE can recognize this is the primary SPS scheduling information.

Step 303, at the same time T1, the serving eNB and the non-serving eNB both jointly transmit downlink data to the UE on the designated resource.

And step 304, after 4ms, the UE successfully receives and decodes the downlink data, and sends an ACK response or a NACK response of the HARQ to the service eNB on the PUCCH.

After an SPS _ Period, i.e., T1+ SPS _ Period, the serving eNB and the non-serving eNB automatically transmit new downlink data jointly on the same resource in the last transmission in step 305. The joint transmission of the downlink data at each periodic time is repeated until the serving eNB indicates the end of the SPS scheduling.

A system for scheduling resources between enbs, the system comprising: a configuration unit, a notification unit, and a transmission unit. The configuration unit is used for configuring the resources in the resource reservation queue and the time corresponding to the resources. And a notification unit configured to notify the non-serving eNB of the configured resource and a time corresponding to the resource by the serving eNB. And a transmitting unit, configured to transmit the data jointly on the resource simultaneously by the serving eNB and the non-serving eNB according to the time corresponding to the resource.

Here, in the dynamic scheduling mode, the notification unit is further configured to notify the non-serving eNB of the scheduling message through the X2 interface by the serving eNB; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of > -.1. And the sending unit is further used for jointly sending the downlink data on Ri by the serving eNB and the non-serving eNB at the time of Ti.

Here, in the SPS method state, the notification unit is further configured to notify the non-serving eNB through an X2 interface scheduling message; wherein, the X2 interface scheduling message includes: each identical resource R configured in the resource reservation queue, an initial time T1 corresponding to the initial resource, and SPS _ Period. A transmitting unit, further configured to jointly transmit downlink data on R at the same time by the serving eNB and the non-serving eNB at time T1 in an initial state; every time one SPS _ Period state is reached, the serving eNB and the non-serving eNB jointly transmit downlink data at time T1+ SPS _ Period, simultaneously on R.

The other concrete realization of the system is as follows: the system comprises: the device comprises a configuration unit, a notification unit and a receiving unit. The configuration unit is used for configuring the resources in the resource reservation queue and the time corresponding to the resources. And a notification unit configured to notify the non-serving eNB of the configured resource and a time corresponding to the resource by the serving eNB. And a receiving unit, configured to receive data jointly on the resource simultaneously by the serving eNB and the non-serving eNB according to the time corresponding to the resource.

Here, in the dynamic scheduling mode, the notification unit is further configured to notify the non-serving eNB of the scheduling message through the X2 interface by the serving eNB; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of > -.1. And the receiving unit is further used for jointly receiving the uplink data on the Ri by the serving eNB and the non-serving eNB at the time of Ti +4 ms.

Here, the notification unit is further configured to notify the non-serving eNB of the scheduling message through an X2 interface when the SPS method is adopted; wherein, the X2 interface scheduling message includes: each identical resource R configured in the resource reservation queue, an initial time T1 corresponding to the initial resource, and SPS _ Period. A receiving unit, further configured to jointly receive uplink data on R at the same time by the serving eNB and the non-serving eNB at time T1+4ms in an initial state; every time one SPS _ Period state is reached, the serving eNB and the non-serving eNB jointly transmit downlink data at time T1+ SPS _ Period, simultaneously on R.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for scheduling resources between enhanced base stations, the method comprising:

2. The method of claim 1, wherein the serving eNB notifies the non-serving eNB when a dynamic scheduling mode is employed through an X2 interface scheduling message; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of 1 or more;

3. The method according to claim 2, wherein in case of downlink data transmission, before jointly transmitting downlink data on Ri, the method further comprises:

4. The method of claim 2, wherein in case of uplink data reception, before jointly receiving uplink data on Ri, the method further comprises:

after jointly receiving the uplink data on Ri, the method further includes:

5. The method of claim 1, wherein the eNB notifies the non-serving eNB when a semi-persistent scheduling (SPS) mode is employed via an X2 interface scheduling message; wherein, the X2 interface scheduling message includes: the same resources R, the initial time T1 corresponding to the initial resources and the semi-persistent scheduling Period SPS _ Period are configured in the resource reservation queue;

6. The method according to claim 5, wherein in case of downlink data transmission, in an initial state, before jointly transmitting downlink data over R, the method further comprises:

7. The method of claim 5, wherein in case of uplink data reception, in an initial state, before jointly receiving uplink data on R, the method further comprises:

8. A system for scheduling resources between enhanced base stations, the system comprising: a configuration unit, a notification unit, and a transmission unit/reception unit; wherein,

9. The system of claim 8, wherein the notifying unit is further configured to notify the non-serving eNB through an X2 interface scheduling message by the serving eNB in a dynamic scheduling mode; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of 1 or more;

10. The system of claim 8, wherein the notifying unit is further configured to notify the non-serving eNB through an X2 interface scheduling message by the serving eNB in a dynamic scheduling mode; wherein, the X2 interface scheduling message includes: each resource Ri configured in the resource reservation queue and a time Ti corresponding to each resource; i is an integer of 1 or more;

11. The system of claim 8, wherein the notifying unit is further configured to notify the non-serving eNB through an X2 interface scheduling message when in the SPS mode state; wherein, the X2 interface scheduling message includes: the same resources R, the initial time T1 corresponding to the initial resources and SPS _ Period are configured in the resource reservation queue;

12. The system of claim 8, wherein the notifying unit is further configured to notify the non-serving eNB through an X2 interface scheduling message when in the SPS mode state; wherein, the X2 interface scheduling message includes: the same resources R, the initial time T1 corresponding to the initial resources and SPS _ Period are configured in the resource reservation queue;