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WO2011071317A2 - Procédé et appareil de réalisation d'un accès basé sur la concurrence dans un système de communication entre mobiles - Google Patents

Procédé et appareil de réalisation d'un accès basé sur la concurrence dans un système de communication entre mobiles Download PDF

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Publication number
WO2011071317A2
WO2011071317A2 PCT/KR2010/008788 KR2010008788W WO2011071317A2 WO 2011071317 A2 WO2011071317 A2 WO 2011071317A2 KR 2010008788 W KR2010008788 W KR 2010008788W WO 2011071317 A2 WO2011071317 A2 WO 2011071317A2
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Prior art keywords
contention
transmission
data
base station
terminal
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PCT/KR2010/008788
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English (en)
Korean (ko)
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WO2011071317A3 (fr
Inventor
김성훈
리에샤우트게르트 잔 반
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US13/514,488 priority Critical patent/US9967901B2/en
Publication of WO2011071317A2 publication Critical patent/WO2011071317A2/fr
Publication of WO2011071317A3 publication Critical patent/WO2011071317A3/fr
Anticipated expiration legal-status Critical
Priority to US15/971,361 priority patent/US10251195B2/en
Priority to US16/369,342 priority patent/US10694544B2/en
Priority to US16/906,442 priority patent/US11102813B2/en
Priority to US17/408,809 priority patent/US11723066B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a mobile communication system, and more particularly, to a method and apparatus for performing contention-based access in a mobile communication system.
  • a mobile communication system has been developed for the purpose of providing communication while securing user mobility.
  • Such a mobile communication system has reached a stage capable of providing high-speed data communication service as well as voice communication due to the rapid development of technology.
  • LTE Long Term Evolution
  • LTE-A advanced LTE communication system
  • One of the technologies to be newly introduced in the LTE-A may be contention based access.
  • the reverse transmission is performed through a dedicated transmission resource allocated by the base station, so that no reverse transmission collision occurs.
  • a base station may use a portion of transmission resources as contention-based access resources.
  • the transmission resource known as the contention-based access resource is freely used by terminals to transmit data.
  • Reverse transmission through a contention-based transmission resource may inevitably cause a so-called collision in which a plurality of terminals transmit signals through the same transmission resource.
  • competition-based transmission has low reliability, unexpected side effects may occur when contention-based transmission is allowed indiscriminately for all data.
  • the present invention has been made to solve the above problems, and an object of the present invention is to propose a contention-based reverse transmission method and apparatus that can efficiently perform backward transmission through contention-based transmission resources and ensure reliability. .
  • a method of performing contention based access of a terminal detects whether contention-based access is allowed to each of at least one logical channel, and contention-based from a base station. Receiving a reverse grant and transmitting data to the base station over a logical channel allowing contention-based access. In this case, whether to allow contention-based access to the logical channel may be signaled by the base station (notified by a control message) or may be initially set between the terminal and the base station.
  • the terminal may stop the contention-based uplink transmission.
  • a method for performing contention based access of a terminal includes whether there is data to be transmitted through a signaling radio bearer 0 (SRB0) channel when data to be transmitted is generated.
  • a terminal performing contention based access may include a transceiver and at least one logical channel, each of which transmits and receives data or control information through a wireless channel.
  • a contention-based access control unit configured to detect whether contention-based access is allowed, to monitor or receive a contention-based reverse grant from the base station, and to transmit data to the base station through a logical channel in which contention-based access is allowed. It is done. In this case, whether to allow contention-based access to the logical channel may be signaled by the base station (notified by a control message) or may be initially set between the terminal and the base station.
  • the terminal may stop the contention-based uplink transmission.
  • a terminal performing contention based access includes a transceiver for transmitting and receiving data or control information through a wireless channel and a signaling radio bearer 0 when data is transmitted.
  • SRB0 confirms the existence of data to be transmitted through the channel, and stops monitoring of the contention-based reverse grant from the base station in the presence of data to be transmitted through the SRB0 channel, and from the base station in the absence of data to be transmitted through the SRB0 channel
  • a contention-based access control unit controlling to perform contention-based reverse grant reception monitoring.
  • contention-based access can be efficiently performed and transmission reliability can be secured.
  • FIG. 1 is a diagram illustrating a structure of an LTE mobile communication system.
  • FIG. 2 is a diagram illustrating a protocol structure of an LTE mobile communication system.
  • FIG. 3 is a diagram illustrating a general reverse transmission process in an LTE mobile communication system.
  • FIG 4 illustrates an example of contention-based access in an LTE mobile communication system.
  • FIG. 6 is a diagram showing the operation of the terminal of the first embodiment
  • FIG. 11 is a diagram showing the operation of the terminal of the fourth embodiment.
  • FIG. 12 is a diagram illustrating a terminal operation of the fifth embodiment.
  • FIG. 13 is a diagram illustrating a terminal RLC operation of the sixth embodiment.
  • FIG. 14 is a diagram illustrating UE RLC operation according to a sixth embodiment when T-pollretransmit has expired.
  • 15 is a diagram illustrating a terminal device.
  • 16 is a diagram illustrating a terminal RLC device.
  • FIG. 17 illustrates a base station apparatus.
  • the present invention provides a method for securing transmission reliability after performing backward transmission in selecting data to perform contention-based uplink transmission in the uplink transmission through contention-based access transmission resources, and for efficient contention-based uplink transmission; Present the device.
  • FIGS. 1, 2, and 3. 1 is a diagram illustrating the structure of an LTE mobile communication system.
  • FIG. 1 is a diagram illustrating the structure of an LTE mobile communication system.
  • a radio access network of an LTE mobile communication system includes a next-generation base station (hereinafter referred to as an Evolved Node B, ENB or Node B) 105, 110, 115, and 120 and MME (125 Mobility Management). Entity) and S-GW (130 Serving-Gateway).
  • the user equipment (hereinafter referred to as UE) 135 connects to an external network through the ENB and S-GW.
  • the ENBs 105 to 120 correspond to existing Node Bs of the UMTS system.
  • the ENB is connected to the UE 135 by a radio channel and performs a more complicated role than the existing Node B.
  • all user traffic including real-time services such as Voice over IP (VoIP) over the Internet protocol, is serviced through a shared channel, which requires a device that collects the UE's context information and schedules it. 105-120).
  • VoIP Voice over IP
  • One ENB typically controls multiple cells.
  • LTE uses Orthogonal Frequency Division Multiplexing (OFDM) as a radio access technology in a bandwidth of up to 20 MHz.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the S-GW 130 is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME 125.
  • the MME 125 is a device in charge of various control functions and is connected to a plurality of base stations.
  • FIG. 2 is a diagram illustrating a radio protocol structure of an LTE mobile communication system.
  • the wireless protocol of the LTE system includes packet data convergence protocols 205 and 240 (PDCP), radio link control 210 and 235 (RMC), and medium access control 215 and 230 (MAC).
  • the PDCP Packet Data Convergence Protocol
  • RLC Radio Link control
  • the MACs 215 and 230 are connected to several RLC layer devices configured in one terminal, and multiplex RLC PDUs to MAC PDUs and demultiplex RLC PDUs from MAC PDUs.
  • the physical layers 220 and 225 channel-code and modulate upper layer data, make an OFDM symbol, and transmit it to a wireless channel, or demodulate, channel decode, and transmit an OFDM symbol received through a wireless channel to a higher layer.
  • the data input to the protocol entity based on the transmission is called a service data unit (SDU), and the output data is called a protocol data unit (PDU).
  • SDU service data unit
  • PDU protocol data unit
  • FIG. 3 is a diagram illustrating a typical reverse transmission operation in an LTE mobile communication system.
  • the terminal 305 transmits a scheduling request to the base station 310 to request a transmission resource when the predetermined requirement such as generation of data to be transmitted is satisfied (315).
  • the need for sending a scheduling request is expressed as a scheduling request is triggered, and the scheduling request and the SR are mixed.
  • the scheduling request is classified into a Dedicated Scheduling Request (D-SR) and a Random Access Scheduling Request (RA-SR).
  • the D-SR transmits a scheduling request through a dedicated transmission resource allocated to the terminal.
  • the transmission resource for the D-SR is a dedicated transmission resource capable of transmitting periodically 1-bit information.
  • the UE that owns the transmission resource for the D-SR transmits the D-SR when the scheduling request needs to be transmitted.
  • the base station 310 Upon receiving the scheduling request signal, the base station 310 allocates a reverse transmission resource to the terminal 305.
  • Information for allocating uplink transmission resources is called a uplink grant, and the uplink grant is transmitted to the terminal 305 through a physical downlink control channel (PDCCH) (320).
  • the reverse grant is identified to which UE the reverse grant is transmitted by a Cell-Radio Network Temporary Identity (C-RNTI) which is an identifier of a terminal.
  • C-RNTI Cell-Radio Network Temporary Identity
  • the reverse grant stores transmission resource information for the terminal 305 to perform reverse transmission, MCS information to be applied for reverse transmission, information necessary for HARQ operation, and the like.
  • the terminal 305 receives the reverse grant according to the information. Reverse transmission is performed when a predetermined period has elapsed at one point in time. While the terminal 305 has data to transmit, the base station 310 may continuously allocate a reverse grant to the terminal.
  • FIG. 4 is a diagram schematically illustrating a contention-based access operation.
  • Base station 410 determines to schedule contention-based access transmission resources at any point in time (415). For example, the time may be a case in which there is a transmission resource remaining without being allocated to the terminal because the load of the cell is not large. Since the contention-based access transmission resource is a transmission resource allocated to an unspecified number, the contention-based access transmission resource is allocated through a predetermined pre-known (or individually informed of connection state terminals) identifier, not C-RNTI, which is a terminal unique identifier. The identifier is called CB-RNTI (Contention Based-Radio Network Temporary Identity). The base station 410 transmits a reverse grant identified as CB-RNTI in step 420. The reverse grant identified with CB-RNTI and the contention-based reverse grant are mixed below. Upon receipt of the contention-based reverse grant, the terminal 405 transmits data using the contention-based reverse grant, if there is data to be transmitted (425) (430).
  • CB-RNTI Contention Based-Radio Network Temporary Identity
  • step 430 If there is more than one terminal that has data to be transmitted and has received a contention-based uplink grant, a collision occurs in the uplink transmission of step 430, which increases the possibility of transmission failure. In addition, transmission of data requiring high reliability on a competitive basis may cause problems in important communication procedures.
  • the logical channel is composed of a PDCP device and an RLC device configured to process data requiring a specific QoS, and typically one logical channel is generated per service. Therefore, data transmitted / received through one logical channel may have different importance or required QoS, and transmission of data of a specific logical channel on a contention-based basis may not satisfy the required QoS.
  • the RRC connection establishment request message or the RRC connection reset request message is transmitted through a logical channel called SRB (Signaling Radio Bearer) 0, and the RLC device of the logical channel operates in a translent mode (RLC TM) and does not support ARQ.
  • VoIP typically operates in RLC Unacknowledged Mode (UMC), which does not support ARQ. If VoIP packets are transmitted on a contention basis, there is a high possibility of failing to meet the required transmission reliability due to transmission failure due to collision.
  • UMC RLC Unacknowledged Mode
  • contention-based transmissions do not cause excessive padding without contention-based transmissions.
  • the present invention provides a method and apparatus for performing contention-based transmission only when certain conditions are met.
  • FIG. 5 is a flowchart illustrating a contention based transmission process according to the first embodiment of the present invention.
  • the base station 510 indicates whether to allow contention-based access for each logical channel through the call setup process or the like (515). As described above, it is preferable that a logical channel that has a high transmission success rate but does not provide a separate ARQ function does not allow contention-based access. Instead of the base station then establishing a logical channel that does not allow contention-based access, there is also a way to ensure that a particular logical channel does not always allow contention-based access. For example, you can use one of two rules:
  • the UE does not attempt contention-based access and does not monitor the CB-RNTI when it has only data generated from SRB 0.
  • the UE does not monitor the CB-RNTI without attempting contention-based access when it has only data generated from a logical channel driven only by RLC TM or RLC UM.
  • the terminal monitors the CB-RNTI without attempting contention-based access if only the logical channel data for which contention-based access is not allowed is allowed. I never do that.
  • the UE 505 that sets up logical channels and recognizes which logical channels are allowed to have contention-based access and which logical channels is not allowed to have contention-based access starts CB-RNTI monitoring when predetermined conditions are satisfied.
  • Monitoring CB-RNTI means monitoring whether a reverse grant identified as CB-RNTI is received over the forward control channel.
  • the terminal 505 Upon receiving the contention-based reverse grant in step 520, the terminal 505 proceeds to step 525 to configure the MAC PDU using data of the remaining logical channels except for the logical channels for which contention-based access is not allowed.
  • the process of determining the amount of data to be transmitted for each logical channel according to a transmission resource and a transmission format allocated by the reverse grant received by the terminal 505 is called a logical channel prioritization (LCP) process.
  • LCP logical channel prioritization
  • the terminal 505 excludes logical channels for which contention-based access is not allowed in the LCP process so that data of logical channels for which contention-based access is not allowed is not stored in reverse data transmitted on a contention-based basis.
  • step 530 the UE 505 determines whether contention-based backward transmission is performed by checking the amount of padding to be included in the MAC PDU to be transmitted and the backward transmission power required for the MAC PDU transmission. If it is determined to perform contention-based uplink transmission, the terminal 505 proceeds to step 535 and transmits MAC PDUs on a contention-based basis.
  • FIG. 6 is a flowchart illustrating an operation sequence of a terminal according to the first embodiment of the present invention.
  • step 605 the UE 505 recognizes which logical channels of the logical channels are allowed to have contention-based access and which logical channels are not allowed to have contention-based access. Whether to allow contention-based access for each logical channel may be set through a control message, and the operation mode of the RLC entity configured in the logical channel (for example, logical channels operating with RLC TM and RLC UM cannot use contention-based backward transmission). Thus, it may be determined and a particular logical channel (eg SRB 0) may be predefined so that contention-based access is not possible.
  • a particular logical channel eg SRB 0
  • step 610 if the reverse grant is received, the terminal 505 proceeds to step 615 and checks whether the received reverse grant is a contention-based reverse grant or a general reverse grant. do.
  • Steps 620, 625, and 630 are LCP processes performed by the terminal 505 when receiving a general reverse grant, and are described in detail in 5.4.3.1 of the standard document 36.321.
  • the terminal 505 allocates a resource corresponding to the size of Bj from the logical channel having the highest priority. It subtracts from the total resource as much as the allocated resource, and if there is any remaining resource, allocates a resource corresponding to Bj to the next highest logical channel.
  • the terminal 505 repeats until resources are allocated to all logical channels having no resources or Bj remaining in the operation. Priority is assigned to each logical channel during call setup and has a value between 0 and 7.
  • Bj is a token managed by logical channel. The token is to guarantee a minimum bit rate for each logical channel. The token is increased to a predetermined size every subframe, and is deducted by the amount of data transmitted when data is transmitted in the corresponding logical channel.
  • the terminal 505 After completing step 620, the terminal 505 proceeds to step 625 and deducts resources allocated in Bj for each logical channel. If there are resources remaining even after allocating resources to all logical channels having Bj, the terminal 505 proceeds to step 630 and the remaining resources are exhausted from the higher priority logical channels, and all remaining transmission resources are exhausted or more data is transmitted. Assign until no longer exists.
  • the terminal 505 configures RLC PDUs for each logical channel according to the size of resources allocated for each logical channel in the LCP process, multiplexes the RLC PDUs, and generates and transmits the MAC PDU. If the amount of data to be sent is small compared to the allocated transmission resource and the transmission resource remains, the remaining transmission resources are filled with padding bits.
  • the terminal 505 proceeds to step 635 and performs LCP considering only logical channels allowed for contention-based access. In this case, Bj is not deducted in consideration of the fact that the contention-based access has a high transmission failure rate.
  • the UE 505 allocates resources corresponding to Bj in order of priority from the highest logical channels among the remaining logical channels except the logical channels for which contention-based access is not allowed. Subtract all resources from the allocated resources, and if there are remaining resources, allocate the resources corresponding to Bj to the next highest logical channel among the logical channels allowed for contention-based backward transmission. The terminal 505 repeats until resources are allocated to all of the logical channels having Bj among the logical channels for which there is no resource remaining or the contention-based reverse transmission is allowed.
  • the terminal 505 skips the Bj subtraction step and proceeds to step 637 so that the logical channel in which contention-based reverse grant is allowed according to the priority of the remaining transmission resources is performed. Assigned to them.
  • the terminal 505 proceeds to step 640 to determine whether to perform contention-based uplink transmission.
  • the terminal 505 checks whether the required uplink transmission power is higher than a predetermined reference value when performing the uplink transmission according to the contention-based uplink grant.
  • the reference value is a threshold value determined that backward transmission becomes inefficient when the reverse transmission output exceeds the value, and may be, for example, a maximum transmission output of the terminal 505. Alternatively, the terminal 505 may have a predetermined ratio of the maximum transmission power.
  • the terminal 505 compares the amount of padding bits to be stored in the MAC PDU to be transmitted when the backward transmission is performed according to the contention-based grant with a predetermined reference value. If it proceeds to abandon backward transmission and the amount of padding bits is less than or equal to the reference value, the process proceeds to step 650 to generate and transmit a MAC PDU.
  • the reference value is a threshold value at which the reverse transmission is determined to be inefficient when the amount of padding bits exceeds the value, and may be set by the network administrator to an arbitrary value. Since the padding basically means that the reverse transmission is inefficient, the reference value may be set to 0 bytes so that only the terminal having sufficient data so as not to cause the padding may perform contention-based reverse transmission. . Alternatively, the reference value may be an arbitrary integer or a ratio of padding in the MAC PDU according to the network manager's resource management policy. For example, contention-based uplink transmission may be performed only when padding is less than or equal to n bytes, or contention-based uplink transmission may be performed only when a percentage of padding occupies the entire MAC PDU is less than or equal to m%.
  • FIG. 7 is a flowchart illustrating a contention based transmission process according to the second embodiment of the present invention.
  • the base station may generate several contention-based grants simultaneously.
  • the terminal may also receive several contention-based reverse grants at the same time.
  • the UE must select one contention-based reverse grant in some way.
  • the simplest method is to randomly select one reverse grant. Random selection is simple, but not so good in terms of transmission efficiency.
  • the UE when the UE receives several contention-based uplink grants at the same time, the UE selects a contention-based uplink grant that allows the most data transmission. If there are several contention-based reverse grants that satisfy this condition, the reverse grant is selected in consideration of the channel condition of the terminal.
  • a contention-based reverse grant indicating the most data transmission is selected by several UEs.
  • the base station applies a high channel coding to the reverse grant signal so that the contention-based reverse grant that indicates a large amount of data transmission can be selected only by some of the terminals having a good channel condition.
  • the contention-based reverse grant indicative of small data transmission applies low channel coding to the reverse grant signal so that not only a terminal having a good channel condition but also a terminal having a poor channel condition can be received.
  • terminal 1 710 has a good channel condition and terminal 2 705 has a poor channel condition and a base station 715 can transmit 1000 bytes with a contention-based reverse grant that can transmit 200 bytes in any subframe. Assume that a contention-based reverse grant can be transmitted simultaneously. In this case, in step 720, the base station 715 transmits a 1000 byte grant with low reliability so that only the terminal 710 having a good channel situation can be received. In contrast, the base station 715 transmits the 200-byte grant with high reliability so that even the terminal 705 having a poor channel situation can be received in step 725.
  • the terminal 1 710 having a good channel condition receives both a 200 byte grant and a 1000 byte grant, and selects 730 a 1000 byte grant that allows more data transmission.
  • the terminal 2 705 having a poor channel situation receives only the 200-byte grant, the terminal 2 705 selects the 200-byte grant without a choice (735).
  • FIG. 8 is a flowchart illustrating an operation sequence of a terminal according to an embodiment of the present invention.
  • the terminal 705 or 710 When receiving a plurality of contention-based uplink grants in step 805, the terminal 705 or 710 proceeds to step 810, calculates an amount of data that can be transmitted to the contention-based uplink grant, and inputs the value to the variable X.
  • the amount of data that can be transmitted to the contention-based uplink grant may be, for example, the sum of the transmittable data stored in the logical channel allowed for contention-based uplink transmission.
  • the terminals 705 and 710 select a backward grant whose transmission data is closest to X among the reverse grants that have passed the validity check.
  • the amount of data that the terminals 705 and 710 can transmit on a contention-based basis is 100 bytes, four contention-based reverse grants are received, and one contention-based reverse grant indicates 50 bytes of data transmission and the other three reverse directions.
  • the terminals 705 and 710 select contention-based reverse grants indicating 90-byte data transmission, which is a contention-based reverse grant closest to 100 bytes.
  • the terminal (705, 710) checks whether there are a number of contention-based reverse grants selected. If only one contention-based uplink grant has been selected, the process proceeds to step 825 to select the contention-based uplink grant and performs uplink transmission according to the selected uplink grant.
  • the terminal 705, 710 proceeds to step 830 to select one of the plurality of contention-based uplink grants.
  • the terminals 705 and 710 check whether the current channel condition is better than a predetermined reference value.
  • the reference value may be notified to the terminals 705 and 710 in the call setup process.
  • the channel condition may be specifically determined as a path loss value. For example, if the path loss is greater than the reference value, the channel condition is worse than the predetermined criterion, and if the path loss is less than the reference value, the channel condition is better than the predetermined criterion. If the channel condition is worse than a predetermined criterion, the terminals 705 and 710 proceed to step 840.
  • the bad channel condition means that the terminals 705 and 710 are located at the edge of the cell relatively. If the transmission power is used, it may cause interference to other cells. In order to minimize interference to other cells, in step 840, the terminals 705 and 710 randomly select one of the remaining ones except the contention-based uplink grant that requires the highest transmission power among the selected contention-based uplink grants.
  • the contention-based reverse grant that requires the highest transmit power is, for example, a reverse grant with small transmission resources and a high MCS. If the required transmission outputs of the selected contention-based uplink grants are all the same, that is, if they all use the same amount of transmission resources and MCS, the terminals 705 and 710 select one of all the contention-based uplink grants selected.
  • step 835 the UEs 705 and 710 grant the remaining grants except the contention-based uplink grant that requires the lowest demand transmission power among the selected contention-based uplink grants to prevent an increase in the probability of selecting a grant having a low request transmission output. Choose one of these randomly. If the required transmission outputs of the selected contention-based uplink grants are all the same, the terminals 705 and 710 select one of all the contention-based uplink grants selected.
  • FIG. 9 is a flowchart showing the operation procedure of the base station 715 according to the second embodiment of the present invention.
  • the base station 715 proceeds to step 910. For example, the base station 715 may determine that there is a need for transmitting a plurality of contention-based uplink grants when the unused uplink transmission resources are scattered in several frequency bands.
  • the base station 715 determines the MCS level of the contention-based uplink grant such that the amount of transmission data to indicate in the contention-based uplink grant is inversely proportional to the transmission reliability of the uplink grant. For example, a high MCS level is determined for a contention-based reverse grant indicative of a 1000 byte data transmission and a low MCS level is determined for a contention-based reverse grant indicative of a 200 byte data transmission.
  • the base station 715 transmits the contention based reverse grant by applying the determined MCS level.
  • Random access procedures are typically used to send important control messages.
  • the random access procedure consists of a random access preamble transmission, a random access response message reception, and a message 3 transmission.
  • a UE that is performing a random access procedure or has just initiated a random access procedure may receive a contention-based reverse grant.
  • a contention-based uplink grant is received to perform contention-based uplink transmission in a random access preamble or a subframe in which message 3 is transmitted, the terminal should select whether to continue random access procedure or contention-based uplink transmission.
  • the terminal presents the operation of the terminal when the reverse transmission required for the random access procedure overlaps with the contention-based reverse transmission.
  • FIG. 10 is a flowchart illustrating an operation sequence of a terminal according to the third embodiment of the present invention.
  • step 1010 determines whether the subframe in which the uplink grant is transmitted is the same as the subframe in which the message 3 is transmitted. If the two sub-frames are the same, the UE determines that the received contention-based uplink grant is invalid, and proceeds to step 1030 and does not perform contention-based uplink transmission.
  • step 1015 the UE proceeds to step 1015 to compare the size of the padding bit and the reverse transmission output to occur with predetermined reference values when selecting a contention-based reverse grant. Validate the contention-based reverse grant. If it is determined that the received competition-based reverse grant is a valid grant, the process proceeds to step 1020 and, if determined to be an invalid grant, proceeds to step 1030.
  • step 1020 the UE checks whether a preamble should be transmitted in a subframe in which contention-based uplink transmission is performed immediately before performing contention-based uplink transmission. If the random access procedure is triggered for some reason, the UE transmits the random access preamble at a time point closest to the corresponding time point among the subframes capable of transmitting the random access preamble. Since the random access procedure can be triggered at any time, checking whether contention-based reverse transmission and random access preamble transmission are planned in the same subframe is checked at the time when contention-based reverse transmission is imminent.
  • the UE proceeds to step 1030 and abandons the contention-based backward transmission, and the random access preamble transmission is not planned in the subframe in which the contention-based backward transmission is planned. Otherwise, the process proceeds to step 1025 to perform contention-based backward transmission.
  • the terminal in the idle state transmits a message RRC CONNECTION SETUP REQUEST to the base station to transition to the connected state.
  • the UE which was in the connected state but temporarily fell out of service, transmits a RRC CONNECTION REESTABLISHMENT REQUEST message to the base station to restore the connection.
  • the messages are sent on a logical channel called SRB0. If the message is sent in contention-based access, the connection state transition may fail or connection restoration may fail depending on the transmission failure.
  • the terminal checks whether SRB0 data is currently waiting to be transmitted. If SRB 0 data is waiting to be transmitted, no contention-based access is performed to prevent the data from being transmitted on a contention-based basis. Start all procedures to perform contention-based access only if there is no SRB 0 data.
  • FIG. 11 is a diagram illustrating an operation sequence of a terminal according to the fourth embodiment of the present invention.
  • step 1105 If data that can be transmitted to the terminal is generated in step 1105, the terminal proceeds to step 1110 and checks whether there is data to be transmitted to SRB 0 at that time. Since SRB 0 is the highest priority logical channel among all the logical channels, when the SRB 0 data receives the contention-based reverse grant while the SRB 0 data is waiting to be transmitted, the UE applies the conventional logical channel selection process to the contention-based SRB 0 data. To send. In order to prevent this, if there is data to be transmitted in SRB 0, the terminal proceeds to step 1115.
  • step 1115 if the UE is already monitoring the CB-RNTI, the UE stops monitoring the CB-RNTI. In other words, it does not receive contention-based reverse grants.
  • the terminal may perform a random access procedure to the base station after stopping the CB-RNTI monitoring.
  • the UE proceeds to step 1120 and checks whether the CB-RNTI monitoring condition is satisfied at that time.
  • the terminal may have stored high priority data for a certain period of time, or new high priority data may be generated.
  • step 1115 the process proceeds to step 1115, and if the CB-RNTI monitoring condition is satisfied, the process proceeds to step 1125.
  • step 1125 the UE monitors the CB-RNTI. Monitoring the CB-RNTI means monitoring whether a reverse grant addressed to the CB-RNTI is received over the forward control channel.
  • the terminal may transmit data to the base station according to the resource allocation information of the received contention-based reverse grant.
  • the terminal transmits a buffer status report message (BSR) to the base station so that the base station can efficiently allocate the uplink transmission resource.
  • the buffer status report message includes a periodic buffer status report message and a regular buffer status report message.
  • the periodic buffer status report message is triggered when the timer started whenever the buffer status report message is sent, and the regular buffer status report message is triggered when data with higher priority than the data currently stored by the terminal occurs. do.
  • the UE triggers SR and allocates transmission resources to the base station. request.
  • the SR is not triggered together, and the periodic buffer status report is received and transmitted in the reverse transmission by the first allocated grant after the periodic buffer status report is triggered.
  • Periodic buffer status reports or regular buffer status reports should be sent as soon as possible and high transmission reliability should be applied whenever possible. It is desirable to transmit the buffer status report in the contention-based uplink transmission when weighting the fast transmission, and not to send the buffer status report in the contention-based uplink transmission when weighting high transmission reliability.
  • the periodic buffer status report and the regular buffer status report are performed by the contention-based uplink transmission, but when the contention-based uplink transmission is completed, the periodic buffer state report or the normal buffer state is completed. Trigger the report immediately again.
  • FIG. 12 is a flowchart illustrating an operation sequence of a terminal according to the fifth embodiment of the present invention.
  • step 1205 the UE proceeds to step 1210 to generate and transmit the MAC PDU.
  • step 1215 the UE checks whether the backward transmission was a contention-based transmission. If it was not the contention-based transmission, the process proceeds to step 1240 according to the prior art, and if the contention-based transmission proceeds to 1220.
  • step 1220 the UE checks whether a periodic BSR is included in the backward transmission. If the periodic BSR is included and transmitted, the process proceeds to step 1225, otherwise proceeds to step 1230.
  • step 1225 the UE triggers the periodic BSR again to ensure transmission reliability of the periodic BSR. In other words, the periodic BSR is stored in the MAC PDU for transmission in the next reverse transmission.
  • step 1230 the UE checks whether the normal BSR is included in the backward transmission in step 1210. If a regular BSR is included, proceed to step 1235; otherwise, proceed to step 1240. In step 1235, the UE triggers the regular BSR again to ensure the reliability of the regular BSR. In other words, the SR is triggered to request the uplink transmission resource allocation to the base station. When the uplink transmission resource is allocated, the normal BSR is stored in the MAC PDU to perform backward transmission.
  • contention-based transmission Since contention-based transmission has poor transmission reliability, transmission is likely to fail, and it is important to quickly determine whether transmission is successful or failed.
  • the poll bit of the RLC PDU transmitted on the contention basis 1, a method and apparatus for quickly determining whether the transmission success / failure of the RLC PDU transmitted on the contention basis without the transmission of subsequent RLC PDUs is presented. do.
  • FIG. 13 is a flowchart illustrating an operation sequence of a terminal according to the sixth embodiment of the present invention.
  • step 1305 the RLC device generates an RLC PDU.
  • step 1310 the RLC device checks whether the generated RLC PDU is transmitted on a contention basis. If not transmitted on the basis of contention proceeds to step 1315 and proceeds according to the prior art, and proceeds to step 1320 if transmitted on the basis of contention.
  • the UE sets the poll bit of the generated RLC PDU to 1 in order to quickly determine whether the RLC PDU transmitted on a contention basis is successful / failed.
  • the poll bit is a predetermined bit of the header of the RLC PDU. When the poll bit is set to 1, the counterpart RLC device receiving the corresponding RLC PDU generates and transmits an RLC status report message.
  • the RLC device proceeds to step 1325 and stores the serial number of the RLC PDU in which the poll bit is set to 1 in a variable called POLL_SN. Since the serial number of the RLC PDU at any point in time is equal to the value obtained by subtracting 1 from a variable called VT (S), a value obtained by subtracting 1 from VT (S) at that time may be stored in the POLL_SN.
  • the RLC device delivers the RLC PDU to the lower layer and drives T_pollretransmit.
  • T_pollretransmit is to guarantee the transmission reliability of the RLC PDU with the poll bit set to 1. If the status report message is not received until the T_pollretransmit expires, the RLC device sets the poll bit of the next RLC PDU to be transmitted to 1 Request the report message again. In the sixth embodiment of the present invention, if an expired T_pollretransmit was driven for the RLC PDU transmitted on a contention basis, the RLC PDU that was transmitted on the contention basis (and likely the transmission failed) is not simply reset the poll bit. Resend.
  • step 1410 is a flowchart illustrating an operation sequence when T_pollretransmit expires of a terminal according to the sixth embodiment of the present invention. If the T_pollretransmit timer expires in step 1405, the RLC device proceeds to step 1410. In step 1410, whether the driving of the T_pollretransmit timer is due to an RLC PDU transmitted on a contention basis, that is, transmitting an arbitrary RLC PDU on a contention basis, setting the poll bit to 1 and driving the T_pollretransmit timer. Check it. If the driving of the expired T_pollretransmit timer is due to the RLC PDU transmitted on a contention basis, the RLC device proceeds to step 1420. If the driving of the T_pollretransmit timer is not due to the RLC PDU transmitted on a contention basis, the RLC device proceeds to step 1415.
  • step 1420 means that the transmission of the RLC PDU transmitted on the basis of contention is highly likely to fail. Therefore, the poll bit is set to 1 and the RLC PDU transmitted on the contention basis is retransmitted. This is equivalent to retransmitting the RLC PDU of the serial number stored in POLL_SN.
  • the RLC device proceeding to step 1415 performs the prior art operation such as setting the poll bit of the next transmitted RLC PDU to 1, updating the POLL_SN, and driving the T_pollretransmit timer.
  • 15 is a block diagram illustrating a terminal device according to embodiments of the present invention.
  • the upper layer device is not shown in the terminal device block diagram of FIG. 15.
  • the upper layer device is a PDCP device and an RLC device configured for each logical channel.
  • the configuration of FIG. 15 includes a multiplexing and demultiplexing apparatus 1505, a HARQ processor 1510, an SR / BSR controller 1515, a contention-based access controller 1520, and a transceiver 1525.
  • the contention-based access controller interprets the contention-based uplink grant received through the forward control channel, determines whether to use the contention-based uplink grant, and controls the transceiver to perform the uplink transmission accordingly.
  • the contention-based access controller recognizes a logical channel to which contention-based access is allowed, and when a contention-based reverse grant is received, a logical channel selection process in consideration of data of logical channels to which contention-based access is allowed. Control the multiplexing and demultiplexing device to perform. In addition, it is determined whether contention-based uplink transmission is performed in consideration of the padding bit situation and the uplink transmission output situation of the generated MAC PDU.
  • the contention-based reverse access control unit when the contention-based reverse access control unit receives a plurality of contention-based reverse grants, the contention-based reverse access control unit selects a reverse grant of a size closest to the amount of data for contention-based reverse transmission, and performs reverse transmission according to the grant. Control the multiplexing and demultiplexing device and the transceiver.
  • the contention-based reverse access control unit monitors whether contention-based reverse transmission collides with message 3 transmission or preamble transmission, and if they collide, the multiplexing and demultiplexing apparatus and the transceiver unit do not cause contention-based reverse transmission. To control.
  • the contention-based reverse access controller determines whether contention-based reverse transmission is based on the presence of SRB 0 data.
  • the contention-based reverse access control unit controls the SR / BSR control unit so that the BSR is triggered again when the periodic BSR or regular BSR is transmitted on the contention basis.
  • the SR / BSR controller monitors whether upper layer data is generated or the like and determines whether to trigger a BSR. When the BSR is triggered, it triggers the SR transmission process. In addition, according to the instructions of the contention-based reverse access control triggers a periodic BSR or regular BSR.
  • the transceiver unit 1525 of the terminal is an apparatus for transmitting and receiving MAC PDUs or control information through a wireless channel.
  • the device receives the HARQ packet.
  • the HARQ processor 1510 is a set of soft buffers configured to perform an HARQ operation and is identified by a HARQ process identifier.
  • the multiplexing and demultiplexing apparatus performs a logical channel selection process and notifies the amount of data to be transmitted for each logical channel. Data transmitted from several logical channels are concatenated to form a MAC PDU, or MAC PDUs are demultiplexed into MAC SDUs to be delivered to an appropriate logical channel.
  • FIG. 16 is a block diagram of a terminal RLC device according to Embodiment 6 of the present invention.
  • the RLC device includes an RLC transmission buffer 1605, an RLC header inserter 1610, an RLC retransmission buffer 1615, a polling bit setting unit 1620, and a polling control unit 1625, and a multiplexing and demultiplexing device 1630. Connected.
  • the RLC transmit buffer is a buffer for storing PDCP PDUs, and when generating an RLC PDU, a set or part of PDCP PDUs corresponding to the payload size of the RLC PDU is transmitted to the RLC header inserter.
  • the RLC header inserter inserts a predetermined header field (RLC serial number, length indicator, etc.) into the payload of the RLC PDU to generate the RLC PDU.
  • the RLC PDU generated by the RLC header inserter is transferred to the polling bit setter and the RLC retransmission buffer.
  • the RLC retransmission buffer is a buffer that is stored until the RLC PDU is successfully transmitted.
  • the RLC retransmission buffer retransmits the RLC PDU when the polling control unit or the state retransmission control unit instructs the retransmission of a specific RLC PDU, although not shown in the drawing.
  • the polling control unit controls the polling bit setting unit to set the polling bit of the RLC PDU having a specific condition, which is satisfied, to 1.
  • the specific condition may include, for example, that an RLC PDU is transmitted on a contention basis.
  • t-pollretransmit is driven.
  • the t-pollretransmit expires, if the RLC PDU triggering the t-pollretransmit is transmitted on a contention basis, the RLC retransmission buffer is controlled to retransmit the RLC PDU corresponding to the POLL_SN.
  • FIG. 17 is a block diagram of a base station apparatus according to an embodiment of the present invention.
  • the higher layer device is not shown in the base station device block diagram of FIG. 17. 17, the multiplexing and demultiplexing apparatus 1705, a HARQ processor 1710, a transceiver 1715, a contention-based reverse grant controller 1720, and a scheduler 1725 are included.
  • the contention-based uplink grant controller determines whether to assign a contention-based uplink grant in consideration of the uplink transmission resource situation.
  • the contention-based reverse grant control unit also determines an MCS level to apply to the contention-based reverse grant determined to allocate.
  • the contention-based reverse grant that indicates a large amount of data transmission applies a high MCS level so that only terminals with good channel conditions can be received, and the contention-based reverse grant that indicates a small amount of data transmission can receive terminals with poor channel conditions. Apply a lower MCS level.
  • the contention-based uplink grant control unit transmits to the scheduler contention-based uplink grants determined to be allocated and the MCS level to be applied to each grant.
  • the scheduler determines which uplink transmission resource to allocate to which UE in consideration of the priority and quantity of the reported uplink data, the channel status of the UE, and generates a reverse grant accordingly, and transmits the uplink grant to the transceiver.
  • the contention-based reverse grant control unit generates a contention-based reverse grant request for transmission and transmits it to the transceiver.
  • the transceiver is controlled so that an appropriate MCS level is applied to each reverse grant. It also controls the transceiver to receive and decode reverse transmissions generated by the reverse grant.
  • the scheduler also informs the contention-based uplink grant control if there is any uplink transmission resources left over.
  • the transceiver 1715 is a device for transmitting and receiving MAC PDUs or control information through a wireless channel.
  • the HARQ processor 1710 is a set of soft buffers configured to perform an HARQ operation and is identified by a HARQ process identifier.
  • the multiplexing and demultiplexing apparatus concatenates data transmitted from several logical channels to form a MAC PDU or demultiplexes the MAC PDUs into MAC SDUs and delivers them to the appropriate logical channel.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil où un terminal effectue un accès basé sur la concurrence (contention-based, CB) dans un système de communication entre mobiles, le procédé comportant : une étape de détection consistant à détecter si un accès basé sur la concurrence est autorisé ou non pour au moins une voie logique ; une étape de réception consistant à recevoir d'une station de base une attribution inverse basée sur la concurrence ; et une étape d'émission consistant à émettre des données vers la station de base par l'intermédiaire de la voie logique pour laquelle l'accès basé sur la concurrence est autorisé. Selon la présente invention, un accès basé sur la concurrence peut être réalisé de manière efficiente et la fiabilité d'émission peut être assurée.
PCT/KR2010/008788 2009-12-11 2010-12-09 Procédé et appareil de réalisation d'un accès basé sur la concurrence dans un système de communication entre mobiles Ceased WO2011071317A2 (fr)

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US13/514,488 US9967901B2 (en) 2009-12-11 2010-12-09 Method and apparatus for performing contention-based access in a mobile communication system
US15/971,361 US10251195B2 (en) 2009-12-11 2018-05-04 Method and apparatus for performing contention-based access in a mobile communication system
US16/369,342 US10694544B2 (en) 2009-12-11 2019-03-29 Method and apparatus for performing contention-based access in a mobile communication system
US16/906,442 US11102813B2 (en) 2009-12-11 2020-06-19 Method and apparatus for performing contention-based access in a mobile communication system
US17/408,809 US11723066B2 (en) 2009-12-11 2021-08-23 Method and apparatus for performing contention-based access in a mobile communication system

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US15/971,361 Continuation US10251195B2 (en) 2009-12-11 2018-05-04 Method and apparatus for performing contention-based access in a mobile communication system

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US20190230704A1 (en) 2019-07-25
US11102813B2 (en) 2021-08-24
US10251195B2 (en) 2019-04-02
US11723066B2 (en) 2023-08-08
US20120275381A1 (en) 2012-11-01
WO2011071317A3 (fr) 2011-11-03
US20180255574A1 (en) 2018-09-06
US20210385860A1 (en) 2021-12-09
KR101636931B1 (ko) 2016-07-06
US20200322984A1 (en) 2020-10-08
KR20110066468A (ko) 2011-06-17
US10694544B2 (en) 2020-06-23

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