CN101801039A - Method for reducing delay in multiple base station cooperation - Google Patents
Method for reducing delay in multiple base station cooperation Download PDFInfo
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Abstract
A method for reducing delay in multiple base station cooperation belongs to the methods of multiple base station cooperation in the third generation mobile communication long-term evolution project, solving the problem of too large delay in multiple base station cooperation and reducing waiting delay of cooperative users. The method comprises the steps of transmitting by base stations, data sending, judging, positive acknowledgement, negative acknowledgement, retransmitting and failure treating. By arranging the automatic retransmission request protocol following the general packet radio service tunnel protocol, the method realizes consistency of the data on the packet data convergence protocol (PDCP) layer; when receiving the cooperative user data from the service gateway, a service base station transmits the data to a cooperative base station on the PDCP layer; and compared with the existing methods, in the method of the invention, the wire delay of transmitting the retransmitted data from the service base station to the cooperative base station is contained in the radio resource distribution process delay, thereby reducing the sending delay of the retransmitted data of the cooperative user.
Description
Technical field
The invention belongs to the method for multi-base station cooperative in the 3G (Third Generation) Moblie Long Term Evolution project (3G LTE), be specifically related to reduce in a kind of multi-base station cooperative the method for time delay.
Background technology
Mobile radio communication is made up of wireless access network, core net and backbone network three parts.Core net and backbone network are mainly miscellaneous service exchange and transmission service are provided; Wireless access network is mainly portable terminal the access network service is provided, and comprises a plurality of nodes, and node can be base station or user; A sub-district is exactly the management area of a base station, and whole mobile network forms by a lot of cell combination.Add multi-base station cooperative, can effectively improve the communication quality of Cell Edge User.In Access Network, in order to realize the multi-base station cooperative combined dispatching, increase one or more collaboration module, constitute one or more cooperation set, the corresponding cooperation set of each collaboration module, as shown in Figure 1.Collaboration module can be positioned at inside of base station, also can be used as isolated node.The major function of collaboration module comprises: to participating in the base station of cooperation, carry out joint radio resource management; The maintenance of control signaling and transmission etc.Between collaboration module and each base station wired communication interface is set, is responsible for the mutual of multi-base station cooperative control signaling, but does not carry out data information transfer between collaboration module and the base station.
Situation for a plurality of cooperation set exist can be provided with communication interface between the different collaboration module, as shown in Figure 2.
Following scene introduction is done by the multi-base station cooperative system: the user is divided into collaboration user and domestic consumer, the service priority of collaboration user is higher than domestic consumer, domestic consumer is generally Cell Center User, collaboration user is generally Cell Edge User, by base station and user according to the common decision of factors such as user communication quality whether with this user as collaboration user.Each domestic consumer only belongs to a serving BS, and each collaboration user belongs to a serving BS and one or more cooperative base station; Two class user data only arrive serving BS; Domestic consumer receives only the information from serving BS; Collaboration user receives the information of serving BS and cooperative base station transmission simultaneously; Serving BS and cooperative base station could send data to collaboration user when receiving that allocation of radio resources as a result; Collaboration module is only carried out allocation of radio resources to the data of collaboration user in serving BS and the cooperative base station, comprise the resource allocation of new biography data and data retransmission, and this resource allocation result sent to serving BS and cooperative base station by wireline interface, serving BS and cooperative base station send user data according to the allocation of radio resources result; Serving BS and cooperative base station receive after the resource allocation result, utilize the Radio Resource that is not taken by collaboration user to carry out allocation of radio resources for the data of the own domestic consumer that serves; The resource allocation of normal user data is distributed by its serving BS.
Can find, no matter collaboration module is as the isolated node of Access Network, still be positioned at the base station, there are the following problems in the capital: for collaboration user, because (user data of automatic network side is forwarded to the base station to gateway in the future, the base station is forwarded to the user again) only user's data is sent to serving BS, when collaboration module is informed serving BS and cooperative base station to the result of collaboration user data wireless resource allocation, because two base stations will realize that the collaboration user data send simultaneously, and cooperative base station is not also received the data of collaboration user, can not send simultaneously immediately.So serving BS need be the collaboration user data forwarding to cooperative base station, the existence of the wired time delay between the base station will inevitably increase the wait time delay of collaboration user.
Summary of the invention
The invention provides the method that reduces time delay in a kind of multi-base station cooperative, solve the excessive problem of time delay in the multi-base station cooperative, reduce the wait time delay of collaboration user.
The present invention only studies descending multi-base station cooperative.It is to be noted, all kinds of intra-nodes include protocol stack, protocol stack is the set of protocol layer, comprise PDCP (PDCP) layer, Radio Link control (RLC) protocol layer, medium access control (MAC) layer, general packet wireless service tunnel protocol (GTP) layer, data and signaling etc. are handled between each agreement.
Reduce the method for time delay in a kind of multi-base station cooperative of the present invention, serving BS and cooperative base station all are equipped with retransmission timer and the number of transmissions counter in the wireless access network, comprise the steps:
One. step is transmitted in the base station: serving BS is waited for the data of transmitting from gateway, receives that gateway is transmitted to the data of specific collaboration user, the cooperative base station under packet data convergence protocol forwards the data to described specific collaboration user; The radio link control course collaboration module of serving BS sends the data mode report; Collaboration module receives and the storage data status report, is reported as the described data allocations Radio Resource that is transmitted to specific collaboration user according to data mode, and the allocation of radio resources result is sent to serving BS and cooperative base station under the described specific collaboration user; Described data mode report indicates the size of transmitting data;
Two. data sending step: serving BS and cooperative base station under the described specific collaboration user are received the allocation of radio resources result, send described data (adopting the automatic repeat requests of mixing to carry out the transmission first time) to described specific collaboration user simultaneously, affiliated serving BS and cooperative base station are provided with maximum transmission times, the number of transmissions counter is set to one, starts retransmission timer;
Three. determining step: after described specific collaboration user receives data, carrying out channel-decoding, judge whether decoding is successful, is then to change step 4; Otherwise commentaries on classics step 5;
Four. positive acknowledgement step: send positive acknowledgement information to affiliated serving BS and cooperative base station, affiliated serving BS and cooperative base station judge whether to receive positive acknowledgement information, be then to transmit positive acknowledgement information to collaboration module, collaboration module is no longer carried out the data retransmission resource allocation, changes step 1; Otherwise retransmission timer is overtime, changes step 6;
Five. the Negative Acknowledgement step: send Negative Acknowledgement information to affiliated serving BS and cooperative base station, affiliated serving BS and cooperative base station judge whether to receive Negative Acknowledgement information, and being then changes step 6; Otherwise retransmission timer is overtime, changes step 6;
Six. retransmissions steps: affiliated serving BS and cooperative base station judge whether the number of transmissions surpasses maximum transmission times, are then to change step 7; Otherwise, affiliated serving BS and cooperative base station send Negative Acknowledgement information to collaboration module, collaboration module is reported as the described data allocations Radio Resource that is transmitted to specific collaboration user according to the data mode that stores, and the allocation of radio resources result is sent to serving BS and cooperative base station under the described specific collaboration user; Affiliated serving BS and cooperative base station are when receiving that collaboration module data retransmission allocation of radio resources as a result, send data retransmission (adopting the automatic repeat requests of mixing to retransmit) to described specific collaboration user simultaneously, restart retransmission timer, the number of transmissions adds one, changes step 3;
Seven. failure treatment step: send failure, cancellation transfer of data, the automatic repeat requests of startup packet data convergence protocol.
Reduce the method for time delay in the described multi-base station cooperative, it is characterized in that:
In the described step 1, when serving BS and cooperative base station are transmitted data at packet data convergence protocol, use general packet wireless service tunnel protocol, and automatic repeat requests agreement is set under general packet wireless service tunnel protocol, the repeat requests agreement guarantees that the packet data convergence protocol sequence number of serving BS and cooperative base station is consistent automatically; Collaboration module is that the described data allocations resource that is transmitted to specific collaboration user is unit with the logic channel, and the identical priority sequence of all logic channels definition in all logic channels and the cooperative base station in the serving BS, guarantee the identical Radio Resource of each logical channel assignment size of serving BS and cooperative base station, can guarantee to work in coordination with the in full accord of transmission data between the base station like this.
Described automatic repeat requests agreement, it mainly acts on is in order to guarantee the data consistency of serving BS and cooperative base station, even the data forwarding mistake takes place on the wire link, also only can have influence on the correctness of the data of certain cooperation transmission, in fact this situation just carries out also existing in the method for data forwarding after receiving the allocation of radio resources result, so can not cause decreased performance.At the situation that the data forwarding mistake has taken place, can cancel the multi-base station cooperative of current misdata, only send data to collaboration user by serving BS.
Reduce the method for time delay in the described multi-base station cooperative, it is characterized in that:
In the described step 2, the allocation of radio resources result that serving BS and cooperative base station are received is unit with the logic channel, adopts identical time-frequency wireless resource, Modulation and Coding Scheme.
In the method that the present invention proposes, on the one hand, by the consistency that automatic repeat requests agreement has realized the packet data convergence protocol data of serving BS and cooperative base station is set below general packet wireless service tunnel protocol; On the other hand, serving BS just forwards the data to cooperative base station at packet data convergence protocol when receiving the collaboration user data, compare in the method that the allocation of radio resources result who receives collaboration module just carries out the collaboration user data forwarding with existing serving BS, in the method for the present invention, the new biography data are forwarded to wired time delay of cooperative base station by serving BS, Yanzhong when being included in the allocation of radio resources process, thus the transmission delay of collaboration user new biography data reduced.
Description of drawings
Fig. 1 is an embodiment of the invention scene schematic diagram;
Fig. 2 is a schematic flow sheet of the present invention.
Specific implementation
The present invention is further described below in conjunction with embodiment and accompanying drawing.
As shown in Figure 1, one embodiment of the present of invention, this system comprises following a few part: base station 1 and base station 2, be used to receive and dispatch user data and signaling, receive the allocation of radio resources result of collaboration module, be domestic consumer's distributing radio resource, to the positive acknowledgement information of collaboration module forwarding from collaboration user, Negative Acknowledgement information etc.; A collaboration module as the isolated node of Access Network, is used for RRM etc. is carried out in two base stations that participate in cooperation; 4 users are used for transceive data and signaling, and user 1, user 3, user 4 are domestic consumer, and user 2 is a collaboration user; The serving BS of collaboration user 2 is base station 1, and cooperative base station is base station 2; Domestic consumer 1, user's 3 serving BS is base station 1, and the serving BS of domestic consumer 4 is base station 2; Connect by wireline interface between collaboration module and the base station; Connect by standard (standard interface between base station and the base station is defined as X2) between the base station.Among the figure, the hexagon frame table shows the sub-district.
For collaboration user 2, concrete steps as shown in Figure 2.Wherein, the wire link time delay is 3ms, and cooperative base station and serving BS retransmission timer regularly are 20ms, and maximum retransmission was 5 (comprising transmission for the first time).
For domestic consumer 1,3,4, only accept data and signaling from the corresponding with service base station, also only send confirmation to the corresponding with service base station; And its downlink radio resource is distributed by serving BS separately and is responsible for realization.
Claims (3)
1. reduce the method for time delay in the multi-base station cooperative, serving BS and cooperative base station all are equipped with retransmission timer and the number of transmissions counter in the wireless access network, comprise the steps:
One. step is transmitted in the base station: serving BS is waited for the data of transmitting from gateway, receives that gateway is transmitted to the data of specific collaboration user, the cooperative base station under packet data convergence protocol forwards the data to described specific collaboration user; The radio link control course collaboration module of serving BS sends the data mode report; Collaboration module receives and the storage data status report, is reported as the described data allocations Radio Resource that is transmitted to specific collaboration user according to data mode, and the allocation of radio resources result is sent to serving BS and cooperative base station under the described specific collaboration user; Described data mode report indicates the size of transmitting data;
Two. data sending step: serving BS and cooperative base station under the described specific collaboration user are received the allocation of radio resources result, simultaneously send described data to described specific collaboration user, affiliated serving BS and cooperative base station are provided with maximum transmission times, the number of transmissions counter is set to one, starts retransmission timer;
Three. determining step: after described specific collaboration user receives data, carrying out channel-decoding, judge whether decoding is successful, is then to change step 4; Otherwise commentaries on classics step 5;
Four. positive acknowledgement step: send positive acknowledgement information to affiliated serving BS and cooperative base station, affiliated serving BS and cooperative base station judge whether to receive positive acknowledgement information, be then to transmit positive acknowledgement information to collaboration module, collaboration module is no longer carried out the data retransmission resource allocation, changes step 1; Otherwise retransmission timer is overtime, changes step 6;
Five. the Negative Acknowledgement step: send Negative Acknowledgement information to affiliated serving BS and cooperative base station, affiliated serving BS and cooperative base station judge whether to receive Negative Acknowledgement information, and being then changes step 6; Otherwise retransmission timer is overtime, changes step 6;
Six. retransmissions steps: affiliated serving BS and cooperative base station judge whether the number of transmissions surpasses maximum transmission times, are then to change step 7; Otherwise, affiliated serving BS and cooperative base station send Negative Acknowledgement information to collaboration module, collaboration module is reported as the described data allocations Radio Resource that is transmitted to specific collaboration user according to the data mode that stores, and the allocation of radio resources result is sent to serving BS and cooperative base station under the described specific collaboration user; Affiliated serving BS and cooperative base station are when receiving that collaboration module data retransmission allocation of radio resources as a result, send data retransmission (adopting the automatic repeat requests of mixing to retransmit) to described specific collaboration user simultaneously, restart retransmission timer, the number of transmissions adds one, changes step 3;
Seven. failure treatment step: send failure, cancellation transfer of data, the automatic repeat requests of startup packet data convergence protocol.
2. reduce the method for time delay in the multi-base station cooperative as claimed in claim 1, it is characterized in that:
In the described step 1, when serving BS and cooperative base station are transmitted data at packet data convergence protocol, use general packet wireless service tunnel protocol, and automatic repeat requests agreement is set under general packet wireless service tunnel protocol; Collaboration module is that the described data allocations resource that is transmitted to specific collaboration user is unit with the logic channel, and the identical priority sequence of all logic channels definition in all logic channels and the cooperative base station in the serving BS.
3. reduce the method for time delay in the multi-base station cooperative as claimed in claim 1 or 2, it is characterized in that:
In the described step 2, the allocation of radio resources result that serving BS and cooperative base station are received is unit with the logic channel, adopts identical time-frequency wireless resource, Modulation and Coding Scheme.
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| CN101986574A (en) * | 2010-10-02 | 2011-03-16 | 上海交通大学 | Method for optimizing beam forming matrix for multi-base station collaboration system |
| CN102594487A (en) * | 2011-01-13 | 2012-07-18 | 中兴通讯股份有限公司 | Wireless network and coding cooperation method in wireless communication |
| WO2015127670A1 (en) * | 2014-02-28 | 2015-09-03 | 华为技术有限公司 | Data retransmission method and device |
| CN105245592A (en) * | 2015-09-29 | 2016-01-13 | 西安电子科技大学 | Mobile network base station cache content placing method based on nearby cache cooperation |
| CN105340312A (en) * | 2013-04-26 | 2016-02-17 | 三星电子株式会社 | Method and apparatus for allocating resources for communication between base stations |
| CN107683578A (en) * | 2015-12-01 | 2018-02-09 | 华为技术有限公司 | The method and apparatus of radio communication |
| CN109526040A (en) * | 2018-09-21 | 2019-03-26 | 浙江工业大学 | The mobile edge calculations linear search formula time delay optimization method based on non-orthogonal multiple access in more base station scenes |
| CN109802706A (en) * | 2011-10-07 | 2019-05-24 | 华为技术有限公司 | System and method for multicast communication in communication system |
| US11070482B2 (en) | 2011-10-07 | 2021-07-20 | Futurewei Technologies, Inc. | System and method for information delivery with multiple point transmission |
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| CN101986574B (en) * | 2010-10-02 | 2013-05-01 | 上海交通大学 | Method for optimizing beam forming matrix for multi-base station collaboration system |
| CN101986574A (en) * | 2010-10-02 | 2011-03-16 | 上海交通大学 | Method for optimizing beam forming matrix for multi-base station collaboration system |
| CN102594487A (en) * | 2011-01-13 | 2012-07-18 | 中兴通讯股份有限公司 | Wireless network and coding cooperation method in wireless communication |
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| CN109802706A (en) * | 2011-10-07 | 2019-05-24 | 华为技术有限公司 | System and method for multicast communication in communication system |
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| CN105340312A (en) * | 2013-04-26 | 2016-02-17 | 三星电子株式会社 | Method and apparatus for allocating resources for communication between base stations |
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| CN105245592A (en) * | 2015-09-29 | 2016-01-13 | 西安电子科技大学 | Mobile network base station cache content placing method based on nearby cache cooperation |
| CN105245592B (en) * | 2015-09-29 | 2018-07-20 | 西安电子科技大学 | Mobile network base station cache contents laying method based on adjacent cache cooperation |
| CN111049626A (en) * | 2015-12-01 | 2020-04-21 | 华为技术有限公司 | Method and apparatus for wireless communication |
| CN111049626B (en) * | 2015-12-01 | 2021-06-01 | 华为技术有限公司 | Method and apparatus for wireless communication |
| CN107683578A (en) * | 2015-12-01 | 2018-02-09 | 华为技术有限公司 | The method and apparatus of radio communication |
| CN109526040A (en) * | 2018-09-21 | 2019-03-26 | 浙江工业大学 | The mobile edge calculations linear search formula time delay optimization method based on non-orthogonal multiple access in more base station scenes |
| CN109526040B (en) * | 2018-09-21 | 2021-06-18 | 浙江工业大学 | Mobile edge calculation linear search type time delay optimization method for non-orthogonal multiple access |
| CN113543060A (en) * | 2021-07-13 | 2021-10-22 | 东南大学 | Power grid multi-base-station data acquisition system and method based on photon millimeter wave communication |
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