WO2014111748A2 - Method of carrier aggregation-based separation of control plane from user plane - Google Patents

Method of carrier aggregation-based separation of control plane from user plane Download PDF

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Publication number
WO2014111748A2
WO2014111748A2 PCT/IB2013/003014 IB2013003014W WO2014111748A2 WO 2014111748 A2 WO2014111748 A2 WO 2014111748A2 IB 2013003014 W IB2013003014 W IB 2013003014W WO 2014111748 A2 WO2014111748 A2 WO 2014111748A2
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WO
WIPO (PCT)
Prior art keywords
base station
signaling
mac
macro base
pico base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2013/003014
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English (en)
French (fr)
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WO2014111748A3 (en
Inventor
Tao Yang
Seau Sian Lim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent SAS
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Alcatel Lucent SAS
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Filing date
Publication date
Application filed by Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Priority to JP2015553177A priority Critical patent/JP6074063B2/ja
Priority to EP13852340.2A priority patent/EP2946516B1/en
Priority to KR1020157021947A priority patent/KR101693135B1/ko
Publication of WO2014111748A2 publication Critical patent/WO2014111748A2/en
Publication of WO2014111748A3 publication Critical patent/WO2014111748A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers

Definitions

  • the present disclosure relates to the field of wireless communications, and particularly, to a method of carrier aggregation-based separation of a control plane from a user plane in base stations and a user equipment of a wireless communication network.
  • Fig. l illustrates a schematic diagram 100 of a network architecture in the prior art, and as can be apparent, in such a network environment, a macro base station 110 provides underlying network coverage (as illustrated by a dotted background in the figure), and in the meantime, for example, pico base stations 121, 122, 123 and 124 at small power (that is, with small network coverage areas (areas illustrated by oblique lines in the figure) provide a possible network access at a higher speed.
  • a user equipment residing in a coverage area common to the macro base station and a pico base station will be capable of setting up communication connections to both of them concurrently, and this may result in the problem of how to communicate with optimized use of the macro base station and the pico base station for the purpose of maximized and optimized use of the user equipment and the two types of base stations.
  • the macro base station typically serves as a primary service cell in view of convenient mobility management, and at this time the pico base stations serve as secondary service cells correspondingly.
  • RRC signaling will be transmitted over a scheduling grant of the macro base station, and data part will be transmitted over a scheduling grant of a pico base station.
  • the scheduling grant on the macro base station may be underused for the RRC signaling, that is, the remaining scheduling grant on the macro base station may be available to other signaling, but a conventional practice is to have only the RRC signaling transmitted on the macro base station so that the remaining scheduling grant will be wasted; and on the other hand, a type of important "control signaling", i.e., MAC CE signaling, is also desired to be possibly transmitted over a scheduling grant of the macro base station, and transmission thereof over a scheduling grant of the pico base station may suffer a delay in transmission via an X2 interface, and this may be adverse to both communication over the wireless network and optimized subsequent scheduling.
  • MAC CE signaling i.e., MAC CE signaling
  • a first aspect of the invention proposes a method of carrier aggregation-based separation of a control plane from a user plane in base stations of a wireless communication network, wherein the base stations include a macro base station and a pico base station configured respectively to set up communication connections with a user equipment, and the method includes:
  • step b if the remaining scheduling grant on the macro base station after the control signaling is transmitted is available to the first MAC CE signaling, then the macro base station transmitting the first MAC CE signaling; otherwise, the macro base station transmitting the first MAC signaling to the pico base station; and
  • the inventive method can make full and reasonable use of the scheduling grant on the macro base station at the base station side.
  • step c if the remaining scheduling grant on the macro base station after the control signaling and the first MAC CE signaling is transmitted is available, then the data part is transmitted and/or redundancy is filled in the remaining grant.
  • the first MAC CE signaling includes secondary service cell activation/deactivation signaling, TAC signaling or DRX signaling.
  • TAC signaling secondary service cell activation/deactivation signaling
  • DRX signaling DRX signaling
  • a second aspect of the invention provides a method of carrier aggregation-based separation of a control plane from a user plane in a user equipment of a wireless communication network, wherein base stations include a macro base station and a pico base station configured respectively to set up communication connections with the user equipment, and the method includes:
  • the user equipment upon reception of the first indication, the user equipment initiating a process of generating an RLC PDU, including:
  • first and second MAC PDUs at the MAC layer respectively from the first and second RLC PDUs and the second MAC CE signaling and transmitting the first and second MAC PDUs respectively to the macro base station and the pico base station.
  • the step pi further includes:
  • the macro base station and the pico base station communicate with each other via X2 signaling of an X2 interface.
  • the second MAC CE signaling is BSR signaling
  • the first MAC PDU and/or the second MAC PDU include BSR information of a control channel and/or a data channel.
  • the first MAC PDU and the second MAC PDU further includes first forward indication information to instruct the macro base station to forward the BSR information of the data channel or instruct the pico base station to forward the BSR information of the control channel respectively to the macro base station or the pico base station via an X2 interface.
  • the first forward indication is a logic channel group ID or a logic channel ID.
  • the second MAC CE signaling is PHR signaling/extended PHR signaling
  • the first MAC PDU and the second MAC PDU include PHR information of the macro base station and the pico base station, respectively.
  • the second MAC CE signaling is PHR signaling/extended PHR signaling
  • the first MAC PDU or the second MAC PDU includes PHR information of the macro base station and the pico base station, and second forward indication information to instruct the macro base station to forward the PHR information of the pico base station or instruct the pico base station to forward the PHR information of the macro base station respectively to the pico base station or the macro base station via an X2 interface.
  • the methods of carrier aggregation-based separation of a control plane from a user plane at the base station side and the user equipment side can have a grant reasonably configured throughout the network and improve the efficiency of use of a scheduling grant on a macro base station as well as an uplink grant of the macro base station on a user equipment, and moreover, control signaling (e.g., RRC signaling) is transmitted only over the scheduling grant on the macro base station, and a large coverage area and a low frequency of the macro base station make the macro base station highly reliable, and moreover, data is also transmitted over a high-frequency spectrum resource of a pico base station to thereby also improve the transmission rate of the data; and on the other hand, no Hand Over procedure needs to be initiated when a user equipment enters and leaves frequently a small coverage area of the pico base station, so that mobility management will not be influenced. Furthermore, MAC CE signaling of great importance to control is also prioritized to be transmitted over the scheduling grant on the macro base station to thereby lower a delay in
  • Fig. l illustrates the schematic diagram 100 of the network architecture in the prior art
  • Fig.2 illustrates a method 200 of carrier aggregation-based separation of a control plane from a user plane in base stations of a wireless communication network according to the invention
  • Fig.3 illustrates a method 300 of carrier aggregation-based separation of a control plane from a user plane in a user equipment of a wireless communication network according to the invention.
  • Fig. l illustrates the schematic diagram 100 of the network architecture in the prior art, and this figure has been described in the section "Background of the invention", so a repeated description thereof will be omitted here.
  • a first embodiment of the invention 200 proposes a method of carrier aggregation-based separation of a control plane from a user plane in base stations of a wireless communication network, where the base stations include a macro base station 110 and pico base stations 121 , 122, 123 and 124 configured respectively to set up communication connections with a user equipment 130, and the method includes:
  • the macro base station and the pico base stations are configured respectively as a primary service cell (Pcell) and secondary service cells (Scells);
  • controlling signaling is prioritized over first MAC CE signaling to be transmitted over a scheduling grant on the macro base station;
  • step 230 it is determined whether the remaining scheduling grant on the macro base station after the control signaling is transmitted in the step 220 is available to the first MAC CE signaling; and if so, then the macro base station transmits the first MAC CE signaling; otherwise, the macro base station transmits the first MAC signaling to a pico base station, and the pico base station transmits the first MAC signaling; and Finally, in the step 240, the first MAC CE control signaling is prioritized over data part to be transmitted over a scheduling grant on the pico base station.
  • the first MAC CE signaling is transmitted from the macro base station, then the first MAC CE signaling is prioritized to be put into an MAC PDU of the scheduling grant for transport, and then the normal data part is put into the MAC PDU of the scheduling grant for transport; but if the first MAC CE has been transported over the scheduling grant of the macro base station, then only the data part will be transmitted over the scheduling grant of the pico base station.
  • the control signaling is transmitted over the scheduling grant of the macro base station, and the data part is transmitted over the scheduling grant of the pico base station.
  • the remaining scheduling grant on the macro base station may be idle after the control signaling (e.g., conventional RRC signaling) and the first MAC CE signaling is put in the scheduling grant, and at this time the remaining grant will not be used fully and reasonably, thus wasting the scheduling grant on the macro base station.
  • step 230 if the remaining scheduling grant on the macro base station remains after the control signaling (e.g., conventional RRC signaling) and the first MAC CE signaling is transmitted, then the data part is transmitted and/or redundancy is filled in the remaining grant.
  • the control signaling e.g., conventional RRC signaling
  • the first MAC CE signaling will be firstly forwarded to the pico base station and then transmitted over the scheduling grant on the pico base station only if no or no sufficient grant on the macro base station is available to transmission of the first MAC CE signaling on the macro base station, and this can ensure as much as possible timely transmission of the first MAC CE signaling to thereby improve the configurative efficiency throughout the wireless communication network.
  • the first MAC CE signaling includes secondary service cell activation/deactivation signaling, TAC signaling or DRX signaling.
  • TAC signaling secondary service cell activation/deactivation signaling
  • DRX DRX signaling
  • Fig.3 proposes a method according to the invention 300 of carrier aggregation-based separation of a control plane from a user plane in a user equipment of a wireless communication network, where base stations also include a macro base station and pico base stations configured respectively to set up communication connections with the user equipment, and as illustrated in Fig.3, the method includes:
  • a first indication is received from the wireless communication network, where the first indication here can be indication information allowing the user equipment for separation of the control plane from the user plane, for example, when the user equipment enters an overlapping area of coverage areas of a pico base station and the macro base station, the base station side sends the indication information to notify the user equipment that a condition for separation of the control plane from the user plane is satisfied and to instruct the user equipment to separate the control plane from the user plane;
  • the user equipment initiates a process of generating an RLC PDU upon reception of the first indication, where this step can include the following sub-steps:
  • Sub-step 1 control signaling is prioritized over second MAC CE signaling to be transmitted over an uplink grant of the macro base station, and when the remaining uplink grant of the macro base station is available to the second MAC CE signaling, a corresponding part of the grant is reserved for the second MAC CE signaling to form a first RLC PDU and transmit the first RLC PDU to an MAC layer, the first RLC PDU including the control signaling or including the control signaling and reserving the corresponding part of the grant for the second MAC CE; otherwise,
  • Sub-step 2 and the second MAC CE signaling is prioritized over data part to be transmitted over an uplink grant of a pico base station, and if the second MAC CE signaling needs to be transmitted over the uplink grant of the pico base station, then a corresponding part of the grant is reserved for the second MAC CE signaling and a second RLC PDU is formed and transmitted to the MAC layer; and
  • first and second MAC PDUs are formed at the MAC layer respectively from the first and second RLC PDUs and the second MAC CE signaling and transmitted respectively to the macro base station and the pico base station.
  • control signaling is transmitted over the uplink grant of the macro base station, and the data part is transmitted over the uplink grant of the pico base station.
  • the remaining uplink grant on the macro base station may be idle after the control signaling (e.g., conventional RRC signaling) and the second MAC CE signaling is put into the uplink grant, and at this time the remaining grant will not be used fully and reasonably, thus wasting the uplink grant on the macro base station.
  • step 320 if the remaining uplink grant on the macro base station is available after the control signaling (e.g., conventional RRC signaling) and the second MAC CE signaling is transmitted, then the data part is transmitted and/or redundancy is filled in the remaining grant.
  • the control signaling e.g., conventional RRC signaling
  • the second MAC CE signaling will be firstly forwarded to the pico base station and then transmitted over the scheduling grant on the pico base station only if no or no sufficient grant on the macro base station is available to transmission of the second MAC CE signaling on the macro base station, and this can ensure as much as possible timely transmission of the second MAC CE signaling to thereby improve the configurative efficiency throughout the wireless communication network.
  • the sub-step 1 of the step 320 further includes:
  • the data part is put respectively into the uplink grant of the macro base station according to priorities of logic channels dependent upon whether the data part is allowed to use the uplink grant of the macro base station, and the first RLC PDU is generated.
  • the macro base station and the pico base station communicate with each other via X2 signaling of an X2 interface.
  • the second MAC CE signaling can be BSR signaling
  • the first MAC PDU and/or the second MAC PDU include BSR information of a control channel and/or a data channel.
  • the first MAC PDU includes BSR signaling of only a control signaling
  • the second MAC PDU includes BSR signaling of only a data channel, they are transmitted respectively to the macro base station and the pico base station.
  • the first MAC PDU or the second MAC PDU includes BSR information of a control channel and a data channel, which means that all the BSR information (that is, of the control channel and the data channel) will be received by the macro base station or the pico base station, and at this time in such an embodiment, the first MAC PDU and the second MAC PDU further includes first forward indication information to instruct the macro base station to forward the BSR information of the data channel or instruct the pico base station to forward the BSR information of the control channel respectively to the macro base station or the pico base station via the X2 interface.
  • the first forward indication is a logic channel group ID or a logic channel ID.
  • the second MAC CE signaling is PHR signaling/extended PHR signaling
  • the first MAC PDU and the second MAC PDU include PHR information of the macro base station and the pico base station respectively, and at this time the PHR information of the macro base station and the pico base station will be transmitted respectively to the corresponding macro base station and pico base station.
  • the power information of the macro base station and the pico base station will be transmitted respectively without a subsequent forwarding process in which the macro base station forwards the power information of the pico base station to the pico base station or the pico base station forwards the received power information of the macro base station to the corresponding base station.
  • the second MAC CE signaling can be PHR signaling/extended PHR signaling
  • the first MAC PDU or the second MAC PDU includes PHR information of the macro base station and the pico base station, and at this time, like the foregoing BSR information, the PHR information to be received by the pico base station or the macro base station will be received by that pico base station or macro base station, and at this time, second forward indication information will be included to instruct the macro base station to forward the PHR information of the pico base station or instruct the pico base station to forward the PHR information of the macro base station respectively to the pico base station or the macro base station via the X2 interface.
  • the inventive methods of carrier aggregation-based separation of a control plane from a user plane at the base station side and the user equipment side can have a grant reasonably configured throughout the network and improve the efficiency of use of a scheduling grant on a macro base station as well as an uplink grant of the macro base station on a user equipment, and moreover control signaling (e.g., RRC signaling) is transmitted only over the scheduling grant on the macro base station, and a large coverage area and a low frequency of the macro base station make the macro base station highly reliable, and moreover data is also transmitted over a high-frequency spectrum resource of a pico base station to thereby also improve the transmission rate of the data; and on the other hand, no HO procedure needs to be initiated when a user equipment enters and leaves frequently a small coverage area of the pico base station so that mobility management will not be influenced.
  • MAC CE signaling of great importance to control is also prioritized to be transmitted over the scheduling grant on the macro base station to thereby lower a delay in transmission of the MAC CE signal

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/IB2013/003014 2013-01-18 2013-12-23 Method of carrier aggregation-based separation of control plane from user plane Ceased WO2014111748A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2015553177A JP6074063B2 (ja) 2013-01-18 2013-12-23 ユーザ・プレーンからの制御プレーンのキャリア・アグリゲーション・ベースの分離の方法
EP13852340.2A EP2946516B1 (en) 2013-01-18 2013-12-23 Method of carrier aggregation-based separation of control plane from user plane
KR1020157021947A KR101693135B1 (ko) 2013-01-18 2013-12-23 사용자 평면으로부터의 제어 평면의 캐리어 집성-기반 분리 방법

Applications Claiming Priority (2)

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CN201310020470.XA CN103945553B (zh) 2013-01-18 2013-01-18 基于载波聚合实现控制平面和用户平面分离的方法
CN201310020470.X 2013-01-18

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WO2014111748A2 true WO2014111748A2 (en) 2014-07-24
WO2014111748A3 WO2014111748A3 (en) 2014-10-23

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CN107529156A (zh) * 2016-06-20 2017-12-29 电信科学技术研究院 一种上行传输的方法、装置及网络架构
CN107529202A (zh) * 2016-06-20 2017-12-29 电信科学技术研究院 一种下行数据传输的方法、装置及网络架构
US11349557B2 (en) 2018-11-30 2022-05-31 At&T Intellectual Property I, L.P. System model and architecture for mobile integrated access and backhaul in advanced networks

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CN106851743A (zh) * 2016-12-21 2017-06-13 中国科学院上海微系统与信息技术研究所 毫米波通信网络构架及装置
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CN107529156A (zh) * 2016-06-20 2017-12-29 电信科学技术研究院 一种上行传输的方法、装置及网络架构
CN107529202A (zh) * 2016-06-20 2017-12-29 电信科学技术研究院 一种下行数据传输的方法、装置及网络架构
US11349557B2 (en) 2018-11-30 2022-05-31 At&T Intellectual Property I, L.P. System model and architecture for mobile integrated access and backhaul in advanced networks

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WO2014111748A3 (en) 2014-10-23
KR101693135B1 (ko) 2017-01-04
KR20150107828A (ko) 2015-09-23
CN103945553B (zh) 2017-12-12
CN103945553A (zh) 2014-07-23
EP2946516A2 (en) 2015-11-25
JP2016507985A (ja) 2016-03-10
JP6074063B2 (ja) 2017-02-01
EP2946516B1 (en) 2018-10-10

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