WO2013107171A1

WO2013107171A1 - Random access method and system, terminal and base station equipment for multi-carrier system

Info

Publication number: WO2013107171A1
Application number: PCT/CN2012/079038
Authority: WO
Inventors: 刘扬; 喻斌; 杜忠达; 黄亚达; 万璐
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-01-20
Filing date: 2012-07-23
Publication date: 2013-07-25
Also published as: CN103220813A; CN103220813B

Abstract

A random access method for a multi-carrier system comprises: a base station receiving a random access preamble sent by a terminal; and the base station carrying identification information for the terminal to identify the random access response thereof in a sent random access response in a scenario where the base station uses a random access radio network temporary identity (RA-RNTI) to indicate the random access response. The method meets the requirements of a new version protocol to the random access of an MTA in addition to keeping backward compatibility, makes both a terminal which supports the MTA and a terminal which does not support the MTA accurately achieve a random access process in the application of being compatible with cross-carrier scheduling and local carrier scheduling, and has an important value to the project realization of a new version communication system.

Description

Random access method and system for multi-carrier system, terminal and base station device

Technical field

The present invention relates to the field of communications, and in particular to a random access method and system for a multi-carrier system, and a terminal and a base station device.

Background technique

The Long Term Evolution Advance (LTE-Advanced) system is the 3rd Generation Partner Project (3GPP) organization to meet the International Telecommunication Union (IMT). -Advanced ) The standard introduced by the requirements. The LTE-Advanced system is an evolved version based on Long Term Evolution (LTE). It introduces many new technologies to meet the basic needs of IMT-Advanced. One of the most important technologies is carrier aggregation. .

Due to the current shortage of wireless spectrum resources, the spectrum resources owned by mobile operators in the world tend to be scattered, and IMT-Advanced requires higher peak rate indicators (100 Mbps for high mobility and 1 Gbps for low mobility). The current 20MHz bandwidth of the LTE standard cannot meet the requirements of IMT-Advanced, so it needs to be expanded to higher bandwidth, such as 40MHz, 60MHz, or even higher. One of the methods to increase the bandwidth and peak rate is to expand the frequency domain, for example, to expand the bandwidth of several 20MHz-based LTE bands by "carrier aggregation", which is the essence of carrier aggregation technology. Therefore, the LTE-Advanced system also belongs to a multi-carrier system.

In the LTE-Advanced system to which the carrier aggregation technology is applied, the carrier that participates in the aggregation is called a component carrier, and the user equipment (User Equipment, UE for short) can transmit and receive data to and from the eNB on multiple component carriers at the same time. . The component carrier can use the frequency band already defined by LTE, or it can also use the frequency band specially added for LTE-Advanced. Based on the current spectrum resource shortage, it is impossible to always have a continuous component carrier in the frequency domain that can be allocated to the operator, so the component carrier may be continuous or discontinuous in the frequency band. In a carrier aggregation system, for a certain user, there may be one first carrier and one or more second carriers. The first carrier is generally a primary carrier, and can carry signaling and data. The second carrier is mainly used for carrying data, and can also carry part of signaling. The carrier can be divided into an uplink carrier (for data transmission from the user equipment to the control station) and a downlink carrier (for controlling data transmission from the station to the user equipment). The wireless service area corresponding to the first carrier is the first service area, and the wireless service area corresponding to the second carrier is the second service area. In different systems, the concept and name of the first carrier, the first service area and the second carrier, and the second service area will have corresponding definitions.

For example, in an LTE/LTE-A system, a user equipment configured with carrier aggregation has only one Radio Resource Control (RRC) connection in the network. When a radio resource management connection establishment/re-establishment/handover occurs, a service area (Serving Cell) that provides a network access identifier (ΝΑΙ) mobile information and a security input is called a primary cell (PCell). That is, the first service area, and one or more secondary cells (Secondary Cell, SCell), that is, the second service area, can be configured according to the user equipment capability configuration. Further, the carrier corresponding to the primary cell is a primary carrier, and includes a downlink primary component carrier (DL PCC) for controlling station-to-user equipment data transmission, and an uplink master for user equipment to control station number communication. Uplink Primary Component Carrier (UL PCC). Similarly, the carrier corresponding to the secondary cell is a secondary component carrier, where the downlink secondary component carrier (DL SCC ) for controlling the data transmission of the user equipment to the user equipment and the data communication for the user equipment to the control station are included. Uplink Secondary Component Carrier (UL SCC).

In the LTE system, in order to implement and maintain uplink synchronization between the user equipment and the base station, the base station sends a timing advance (Tiing Advance, abbreviated as TA) to each user equipment according to the transmission delay between the base station and each user equipment. The device advances or delays the timing of the respective uplink transmission according to the timing advance sent by the base station, thereby compensating for the transmission delay of the terminal to the base station in the user, so that the uplink signals of different user equipments reach the base station within the receiving window of the base station.

In the LTE system, in order to obtain and maintain the uplink synchronization between the UE and the base station, the base station configures an uplink synchronization timer (TAT) for the UE, and if the UE can receive the base station and sends the UE to the UE before the TAT expires. The amount of time advancement is considered to be uplink synchronization between the UE and the base station, otherwise the TAT times out and the UE considers that the uplink synchronization is lost. Not synced The state or the out-of-synchronization state, the UE obtains the uplink synchronization with the base station by using the random access procedure, and after receiving the random access response (RAR) sent by the base station, the UE starts the timer TAT, and according to the base station, the random The timing of advancement carried in the access response is advanced or delayed. After the UE obtains the uplink synchronization with the base station, during the TAT operation, if the TA (Time Alignment) command (TA command) sent by the base station to the UE is received, the TAT is restarted, and the timing advance carried in the TA (Time Alignment) command is used. The UE considers that it continues to maintain uplink synchronization with the base station in advance or delays the uplink transmission time. If the UE does not receive the TA (Time Alignment) command during the TAT operation, that is, the TAT times out, the UE considers that it has lost uplink synchronization with the base station, and deletes the dynamic. All the uplink and downlink resources allocated to the UE are cleared, and all the hybrid adaptive retransmission buffer (HARQ buffer) data to be sent are cleared, and the RRC sublayer is notified to release the static/semi-static uplink physical resources allocated to the UE. If there is uplink data to be sent or downlink data needs to be received, the UE needs to perform random access first to regain uplink synchronization.

After the carrier aggregation is introduced, the user equipment can work on multiple component carriers at the same time. These component carriers may be continuous or discontinuous in the frequency band; they may be in the same frequency band or may be from different frequency bands. In the case where the component carriers are discontinuous, or the component carriers are from different frequency bands, since the component carriers have different transmission characteristics, the TAs on the component carriers may be different from each other; even if the component carriers belong to the same frequency band and are in the frequency band Continuously, if each component carrier is derived from a different remote radio unit (RRU), or in order to increase cell coverage, each component carrier is processed via a different repeater, respectively, on each component carrier. The timing advances may also differ from each other. In the LTE system, the UE only works on one carrier (one carrier for the time division duplex mode, and one pair of uplink and downlink carriers for the frequency division duplex mode, which is referred to as a carrier for convenience), and only needs to maintain one uplink. The uplink synchronization of the link is called a single TA scenario. In carrier aggregation, the UE can work on multiple component carriers at the same time, and the TAs of these component carriers may be different. This scenario is simply referred to as multiple time advance (multiple TA, MTA)

As described above, in a single TA scenario, the UE obtains uplink synchronization with the base station through a random access procedure. The random access procedure may be initiated by the physical downlink control channel signaling (PDCCH order) or the medium access control (MAC) layer of the UE. Alternatively, the PDCCH order or the RRC signaling may allocate a dedicated random to the UE. Access preamble (Random Access Preamble), the random access procedure is a non-contention based manner; otherwise, the UE needs to select a random access preamble, and the random access procedure is a contention based method. Selecting the random access resource by the UE includes selecting a time-frequency i or a resource of a random access preamble and a physical random access channel (PRACH).

Specifically, the contention-based random access procedure includes the following four steps as shown in FIG. 1: Step 1: The terminal sends a random access preamble through a random access channel (RACH, Random Access Channel, abbreviation). Preamble ) ;

Step 2: The Medium Access Control (MAC) layer of the base station (eNB) generates a random access response (RAR) message on the downlink shared channel (Downlink-Shared Channel, DL-SCH for short). The message is sent to the terminal; the message includes at least a Random Access Preamble Identifier (RAPID), Time Alignment (TA) information, an initial uplink grant (UL Grant, Uplink Grant), and a temporary cell-wireless Temporary C-RNTI; The message passes the Random Access-Radio Network Temporary Identifier on the Physical Downlink Control Channel (PDCCH). Give an indication; where the RA-RNTI is calculated as follows,

RA-RNTI= 1 + t— id+10*f— id

Where t_id is the first subframe index (0 ≤ t_id <10) for transmitting the relevant random access preamble, and f id is the frequency domain resource index corresponding to the random preamble in the t-id subframe in ascending order, (0 ≤ f_id) < 6).

The UE needs to receive this random access response in a predetermined receive window. After receiving the random access response, the terminal determines that the random access radio network temporary identifier (RA-RNTI) corresponds to the time frequency resource for transmitting the random access preamble by itself (the calculation method is as above, that is, the RA-RNTI calculated by the terminal and the received RA) - RNTI-like), and the RAR includes a random access preamble corresponding to the RAPID, and the random access response is its own random access response. If the UE does not receive the expected random access response in the predetermined receiving window, the UE waits for a specified time after restarting the random access according to a storage or a backoff parameter value indicated by the base station (ie, returns to the step). 1 begins execution).

Step 3: The terminal is in the Uplink-Shared Channel (UL-SCH) Cell-Radio Network Temporary Identity (C-RNTI), Medium Access Control Element (MAC Control Element) or Common Control Logical Channel Service Data Unit (CCCH SDU) including Contention Resolution Identity; Support Hybrid Automatic Retransmission Re Quest (HARQ).

Step 4: The base station sends a contention resolution message on the DL-SCH; the message is indicated by a C-RNTI or a temporary C-RNTI (ie, TC-RNTI) on the PDCCH, and may include a contention resolution identifier; The sending of the message supports HARQ.

For the non-contention random access process, there is no competition resolution process (as shown in Figure 2). In the conventional technology, the random access procedure (the random access procedure shown in Figure 1 and Figure 2) can only be performed in the primary cell and cannot be performed in the secondary cell. That is, the random access procedure in the conventional technology is a non-cross-carrier random access procedure, or a random access procedure on a local carrier.

However, in the multi-TA or MTA scenario, obtaining the uplink synchronization on the SCell may not be able to follow the above process. The reason is that the SCell may be scheduled by other cells (secondary cell or primary cell), and the PDCCH or PDCCH on the SCell that does not schedule RAR message resources is interfered by signals of other cells. In this case, the RAR in step 2 can only be scheduled and transmitted on another carrier (as shown in Figure 3), that is, scheduled and transmitted on the scheduling cell.

In this case, the protocol that supports multiple timing advances is called a new protocol (for example, the R11 protocol in LTE-A), and the terminal that supports multiple timing advances is called a new terminal (for example, an R11 terminal), and a protocol that does not support multiple timing advances is called. For the old protocol (such as the R10 protocol in LTE-A), a terminal that does not support multiple timing advances is called an old terminal (for example, an R10 terminal). The cell that is scheduled by the cross-carrier in the present case is called the scheduled cell and can only be the secondary cell, and the scheduling cell can be the primary cell or the secondary cell.

After the new application mode, that is, the cross-carrier random access procedure, is introduced in the multi-carrier system, after the terminal sends a random access preamble on the access cell, it cannot determine which one of them when receiving multiple random access responses (RARs). It is a random access response corresponding to the terminal, and includes the following multiple problems.

Question 1: How to distinguish the random access response returned from the scheduling cell corresponding to the random access preamble sent by the terminal supporting the multi-time advancement on the scheduled cell, and the terminal not supporting the multi-time advancement on the scheduling cell The random access preamble corresponding to the random access response returned from the scheduled cell. As shown in FIG. 4, how to distinguish the random access response corresponding to the terminal 4 and corresponding to The random access response of the terminal 1.

Question 2: How to distinguish the random access response returned from the scheduling cell corresponding to the random access preamble sent by the terminal supporting the multi-time advancement on the scheduled cell, and the terminal supporting the multi-time advancement on the scheduling cell The random access preamble corresponds to the random access response returned from the scheduling cell. As shown in FIG. 4, how to distinguish the random access response corresponding to the terminal 4 from the random access response corresponding to the terminal 2, or how to distinguish the random access response corresponding to the terminal 3 and the random access response corresponding to the terminal 2 .

Question 3: How to distinguish the random access response returned from the scheduling cell corresponding to the random access preamble sent by the terminal supporting the multi-time advancement on the scheduled cell, and the terminal supporting the multi-time advancement in another scheduled cell The random access response returned from the scheduling cell corresponding to the random access preamble sent out, as shown in FIG. 4, how to distinguish the random access response corresponding to the terminal 4 and the random access response corresponding to the terminal 3.

The above problem scenario can be summarized as a problem, that is, a terminal supporting multiple time advances can obtain its own random access response on the scheduling cell in the case of cross-carrier scheduling. Summary of the invention

The embodiments of the present invention provide a random access method and system for a multi-carrier system, and a terminal and a base station device, to solve the problem of how the terminal accurately identifies the random access response corresponding to the random access procedure of the terminal in the multi-carrier system.

In order to solve the above technical problem, an embodiment of the present invention provides a random access method for a multi-carrier system, including:

Receiving, by the base station, a random access preamble sent by the terminal;

In the scenario where the base station uses a random access radio network temporary identifier (RA-RNTI) to indicate a random access response, the base station carries an identifier for the terminal to identify the random access response of the terminal in the sent random access response. information.

The identifier information carried in the random access response includes a random access preamble identifier (RAPID) corresponding to the random access preamble, and identifier information indicating the terminal.

The method also includes: The base station sets the same partial resource in the dedicated random access preamble resource of each cell as a terminal-specific random access preamble resource supporting multiple time advance (MTA).

The terminal is a terminal supporting an MTA;

The identifier information carried in the random access response includes a terminal-specific RAPID that supports the MTA, and identifier information indicating the terminal.

The method also includes:

The base station sets a terminal-specific random access preamble identifier that supports the MTA.

The identification information indicating the terminal is a Cell Radio Network Temporary Identity (C-RNTI).

The random access preamble is received by the base station on the secondary cell, and the random access response is sent by the base station in the primary cell or on the secondary cell different from the secondary cell that sends the random access preamble.

In order to solve the above technical problem, the embodiment of the present invention further provides a random access method for another multi-carrier system, including:

The terminal sends a random access preamble;

The terminal identifies the random access response of the terminal according to the received random access radio network temporary identifier (RA-RNTI) and the identification information carried by the random access response.

The step of the terminal identifying the random access response of the terminal includes:

Determining, by the received RA-RNTI, a time frequency resource corresponding to the random access preamble sent by the terminal, and the identifier corresponding to the random access preamble sent by the terminal in the random access response indicated by the RA-RNTI If the identifier information of the terminal that is carried in the random access response is the same as the identifier of the local terminal, the random access response indicated by the RA-RNTI is a random access response corresponding to the random access procedure of the terminal. .

The terminal is a terminal supporting multiple time advance (MTA);

The identifier information carried in the random access response includes a terminal-specific random access preamble identifier that supports the MTA, and identifier information indicating the terminal.

The step of the terminal identifying the random access response of the terminal includes: Determining, by the received RA-RNTI, the time-frequency resource of the random access preamble corresponding to the terminal, and the random access preamble identifier carried in the random access response indicated by the RA-RNTI is a terminal-specific RAPID supporting the MTA, and the random When the identifier of the terminal that is carried in the access response is the same as the identifier of the local terminal, it is determined that the random access response indicated by the RA-RNTI is a random access response corresponding to the random access procedure of the terminal.

The identification information of the indication terminal is a cell radio network temporary identifier (C-RNTI), and the random access preamble is sent by the terminal on the secondary cell, and the random access response is in the primary cell or different from the sending random connection. The secondary cell of the secondary cell that enters the preamble is received by the terminal.

In order to solve the above technical problem, an embodiment of the present invention further provides a base station device, including a base station side random access process processing module, where

The base station side random access procedure processing module is configured to: receive a random access preamble sent by the terminal, and send a random random in a scenario in which a random access radio network temporary identifier (RA-RNTI) is used to indicate a random access response The access response carries identification information for the terminal to identify the random access response of the terminal.

The base station side random access procedure processing module is further configured to set the same partial resource in the dedicated random access preamble resource of each cell to be a terminal-specific random access preamble resource supporting multiple time advance (MTA).

The terminal is a terminal supporting an MTA;

The base station side random access procedure processing module is further configured to set a random access preamble identifier dedicated to the terminal supporting the MTA.

The identification information indicating the terminal is a cell radio network temporary identifier (C-RNTI).

The base station side random access procedure processing module is configured to receive the random access preamble on the secondary cell, and send the random access response on the primary cell or a secondary cell different from the secondary cell that sends the random access preamble . In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including a terminal side random access process processing module, where

The terminal side random access procedure processing module is configured to: when the base station uses a random access radio network temporary identifier (RA-RNTI) to indicate a random access response, send a random access preamble according to the received RA-RNTI And the identifier information carried in the random access response identifies the random access response of the terminal.

The identifier information carried in the random access response includes a random access preamble identifier corresponding to the random access preamble, and identifier information indicating the terminal.

The terminal side random access procedure processing module is configured to identify a random access response of the terminal by: determining that the received RA-RNTI corresponds to a time frequency resource that the terminal sends a random access preamble, and the RA-RNTI indication The random access preamble identifier carried in the random access response is the same as the identifier corresponding to the random access preamble sent by the local terminal, and the identifier information of the indication terminal carried in the random access response is the same as the local terminal identifier, and the The random access response indicated by the RA-RNTI is a random access response corresponding to the random access procedure of the terminal.

The terminal is a terminal supporting multiple time advance (MTA);

The terminal side random access procedure processing module is configured to identify a random access response of the terminal by: determining, by the received RA-RNTI, a time frequency resource corresponding to the terminal sending the random access preamble, the RA-RNTI indication The random access preamble identifier carried in the random access response is a terminal-specific random access preamble identifier that supports the MTA, and when the identifier of the indication terminal carried in the random access response is the same as the local terminal identifier, the RA- is determined. The random access response indicated by the RNTI is a random access response corresponding to the random access procedure of the terminal. The identification information indicating the terminal is a Cell Radio Network Temporary Identity (C-RNTI).

To solve the above technical problem, an embodiment of the present invention further provides a random access system for a multi-carrier system, including the base station device and the terminal as described above.

The beneficial effect of the present invention is to maintain backward compatibility while satisfying the new version protocol for MTA For the requirement of random access, in the compatible cross-carrier scheduling and local carrier scheduling applications, the terminal supporting MTA and the terminal not supporting MTA can accurately complete the random access process. This solution is of great value to the engineering implementation of the new version of the communication system. BRIEF abstract

1 is a flow chart of a competitive random access procedure in the related art;

2 is a flow chart of a non-contention random access procedure in the related art;

3 is a schematic diagram of a random access procedure in a cross-carrier scheduling application;

4 is a schematic diagram of a method for a random access procedure initiated by a terminal supporting an MTA and a terminal not supporting an MTA in a cross-carrier scheduling and a local carrier scheduling application;

FIG. 5 is a schematic diagram of a random access method of a multi-carrier system according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of a random access preamble configuration manner according to Embodiment 1 of the present invention. Preferred embodiment of the invention

Hereinafter, the detailed description will be made with reference to the accompanying drawings in conjunction with the embodiments. It should be noted that, in the case of no conflict, the features, methods and methods of the various problems in the present application may be combined with each other into different embodiments.

In the cross-carrier scheduling scenario MTA, the terminal acquires the secondary cell uplink synchronization TA (Time Advance) of different TA (Time Advance). When the RAR PDCCH uses the RA-RNTI identifier, the cross-carrier scheduling UE can only use the non-exhaustion. Striving for random access. The base station sets the ra-Preamblelndex to a non-zero (000000) value in the PDCCH that triggers the UE to initiate random access on the SCELL that is scheduled by the cross-carrier, and further sends the parameter to the UE for random access (including random access). The leading ra-Preamblelndex and the random access channel mask index ra-PRACH-Masklndex).

As shown in FIG. 5, the random access method of the multi-carrier system includes: the base station receives a random access preamble sent by the terminal; and the base station uses a random access radio network temporary identifier (RA-RNTI) to indicate a random access response scenario. The base station carries the identifier information for the terminal to identify the random access response of the terminal in the sent random access response. The terminal sends a random access preamble and according to the received The random access wireless network temporary identifier (RA-RNTI) and the identification information carried by the random access response identify the random access response of the terminal.

The random access procedure in this scenario includes: a cross-carrier random access procedure for a terminal supporting multiple time advance (MTA) and a local random access procedure, and local random access of a terminal that does not support multi-time advance (MTA) process.

Embodiment 1

The identifier information carried in the random access response includes a random access preamble identifier (RAPID) corresponding to the random access preamble received by the base station, and identifier information indicating a terminal that sends the random access preamble.

The base station sets the same partial resource in the dedicated random access preamble resource of each cell as a terminal-specific random access preamble resource supporting multiple time advance (MTA), except that the terminal receives the random After the access response, the random access radio network temporary identifier (RA-RNTI) is determined to correspond to the time-frequency resource of the random access preamble, and the random access preamble identifier carried in the random access response indicated by the RA-RNTI When the identifier corresponding to the random access preamble sent by the terminal is the same, and the identifier information of the terminal carried in the random access response is the same as the identifier of the terminal, the random access response is determined to be a random access procedure corresponding to the terminal. Random access response.

Embodiment 2

The identifier information carried in the random access response includes a terminal-specific random access preamble identifier supporting a multi-time advance (MTA), and identifier information indicating a terminal that sends the random access preamble.

The base station sets a random access preamble identifier dedicated to the terminal of the MTA, and after receiving the random access preamble sent by the terminal supporting the MTA, the base station carries the dedicated random access preamble in the sent random access response. Logo.

After receiving the random access response, the terminal determines the random access wireless network temporary identifier (RA-RNTI) Corresponding to the time-frequency resource of the random access preamble, and the random access preamble identifier carried in the random access response indicated by the RA-RNTI is a terminal-specific random access preamble identifier (RAPID) supporting the MTA, and the When the identifier of the terminal carried in the random access response is the same as the identifier of the local terminal, it is determined that the random access response is a random access response corresponding to the random access procedure of the terminal.

In the method, the identifier information of the terminal is a cell radio network temporary identifier (C-RNTI), and the base station identifies a cell radio network temporary identifier (C-RNTI) in a random access response for identifying a temporary cell radio network. The location of the temporary identifier (TC-RNTI).

In this method, the scheduling cell in the cross-carrier random access process may be fixed in the PCell, or may be configured to send a PCell of the random preamble cell or schedule the SCell of the random preamble cell. The random access preamble is received by the base station on the secondary cell, and the random access response is sent by the base station on the primary cell or a secondary cell different from the secondary cell that sends the random access preamble.

The base station device in the solution includes a base station side random access procedure processing module, configured to receive a random access preamble sent by the terminal, and use a random access radio network temporary identifier (RA-RNTI) to indicate a random access response scenario. And transmitting, in the random access response, the identifier information used by the terminal to identify the random access response of the terminal.

The identifier information carried in the random access response includes a random access preamble identifier (RAPID) corresponding to the random access preamble received by the base station, and identifier information indicating a terminal that sends the random access preamble. The base station side random access procedure processing module is further configured to set the same partial resource in the dedicated random access preamble resource of each cell to be a terminal-specific random access preamble resource supporting multiple time advance (MTA).

The identifier information carried in the random access response includes a terminal-specific random access preamble identifier (RAPID) supporting the MTA, and identifier information indicating a terminal that sends the random access preamble.

The base station side random access procedure processing module is further configured to set a random access preamble identifier dedicated to the terminal that supports the MTA, and after receiving the random access preamble sent by the terminal supporting the MTA, the base station carries the random access response in the sent random access response. The dedicated random access preamble identifier. The identifier information of the terminal is a cell radio network temporary identifier (C-RNTI), and the base station side random access procedure processing module is further configured to identify the cell radio network temporary identifier (C-RNTI) in the random access response. A location used to identify the Temporary Cell Radio Network Temporary Identity (TC-RNTI).

The terminal includes a terminal side random access procedure processing module, and is configured to: send a random access preamble in a scenario in which the base station uses a random access radio network temporary identifier (RA-RNTI) to indicate a random access response; The random access response of the terminal is identified according to the received random access radio network temporary identifier (RA-RNTI) and the identifier information carried by the random access response.

The identifier information carried in the random access response includes a random access preamble identifier corresponding to the random access preamble received by the base station, and identifier information indicating a terminal that sends the random access preamble.

The terminal side random access process processing module identifies the random access response of the terminal by: determining that the random access wireless network temporary identifier (RA-RNTI) corresponds to the time frequency resource for transmitting the random access preamble by itself, and The random access preamble identifier carried in the random access response indicated by the RA-RNTI is the same as the identifier corresponding to the random access preamble sent by the local terminal, and the identifier information of the terminal carried in the random access response is the same as the local terminal identifier. And determining that the random access response is a random access response corresponding to the random access procedure of the terminal. The identifier information carried in the random access response includes a terminal-specific random access preamble identifier supporting a multi-time advance (MTA), and identifier information indicating a terminal that sends the random access preamble.

The terminal side random access process processing module further identifies the random access response of the terminal by: determining that the random access wireless network temporary identifier (RA-RNTI) corresponds to the time frequency resource for transmitting the random access preamble, and The random access preamble identifier carried in the random access response indicated by the RA-RNTI is a terminal-specific random access preamble identifier (RAPID) supporting the MTA, and the identifier of the terminal carried in the random access response and the local terminal identifier When the same, it is determined that the random access response is a random access response corresponding to the random access procedure of the terminal.

The base station side random access procedure processing module is configured to: receive the random access preamble on the secondary cell, and send the random on the primary cell or a secondary cell different from the random access preamble Access response.

The identification information of the terminal is a cell radio network temporary identifier (C-RNTI).

The random access system of the multi-carrier system in the solution includes the above-mentioned base station device and the above-mentioned terminal.

In this solution, the scheduling cell may be fixed in the PCell, or may be a PCell that schedules the transmission of the random preamble cell or a SCelL that schedules the transmission of the random preamble cell. The present solution is described in detail by using specific embodiments.

Specific embodiment 1

As shown in FIG. 6, the base station sets one or more common dedicated random access preambles in a random access preamble set of multiple cells as a random access preamble resource dedicated to a new terminal, and the random access dedicated to the new terminal The preamble resource is a dedicated random access preamble in the intersection of dedicated random access preambles of respective random access preamble sets of each cell in the base station, and the random access preamble resources dedicated to the new terminal in each cell are the same. The area filled in the grid as shown in Fig. 6 is a random access preamble resource dedicated to the new terminal on each cell. The old terminal cannot use the random access preamble resources dedicated to the above new terminal.

In the above setting, the terminal that does not support the MTA does not use the random access preamble resource dedicated to the new terminal, and compares the identifier of the random access preamble in the random access response with the random transmission when the terminal initiates the random access procedure. The identifier of the access preamble can distinguish the random access response of the old terminal from the random access response of the new terminal. Corresponding to Fig. 4, the random access response of the terminal 1 and the terminal 2, the random access response of the terminal 1 and the terminal 3, and the random access response of the terminal 1 and the terminal 4 can be distinguished. The problem is solved.

During the local carrier scheduling access process of the new terminal, the terminal supporting the MTA sends a random access preamble dedicated to the new terminal on the scheduling cell, and the base station receives the random access preamble on the scheduling cell to know that the relevant random access response is sent to the terminal. The new terminal will therefore include the RAPID corresponding to the new terminal-specific random access preamble in the relevant RAR message and replace the temporary cell-radio network temporary identifier TC-RNTI with the cell-radio network temporary identifier C-RNTI. The MTA-enabled terminal receives the RAR according to the conventional technology on the scheduling cell, and uses the RAPID and C-RNTI of the transmitted random access preamble to check the RAPID and C-RNTI included in the RAR, if both information are In the same way, it can be judged that the RAR message is sent to itself. If two new terminals use the same specific random access preamble and the same access time frequency resource to initiate random access in the scheduling cell and the scheduled cell, as long as the C-RNTI in the RAR is parsed according to the solution of the present invention, It is accurately determined which terminal of the RAR is the RAR in the random access process. Corresponding to FIG. 4, the terminal 2 and the terminal 3 can be distinguished, and the terminal 2 and the terminal 4 can be distinguished. Question 2 was resolved.

In the inter-carrier scheduling access process, the terminal supporting the MTA sends a random access preamble dedicated to the new terminal on the scheduled cell, and the base station receives the random access preamble on the scheduled cell to know that the relevant random access response is a cross-carrier. Scheduling, therefore, the scheduling cell includes the RAPID corresponding to the specific random access preamble in the relevant RAR message and replaces the temporary cell-radio network temporary identifier TC-RNTI with the cell-radio network temporary identifier C-RNTI. The terminal supporting the MTA receives the RAR according to the conventional technology on the scheduling cell, and uses the RAPID and C-RNTI of the transmitted random access preamble to check the RAPID and C-RNTI included in the RAR. If the two information are the same, the terminal can determine. The RAR message is sent to itself. If two new terminals use the same specific random access preamble and the same access time frequency resource to initiate random access on different scheduled cells, as long as the C-RNTI in the RAR is parsed according to the solution of the present invention, It is accurately determined which terminal of the RAR is the RAR in the random access process. Corresponding to Fig. 4, terminal 3 and terminal 4 can be distinguished. Question 3 is resolved.

Specific embodiment 2

In the second embodiment, one or more random access preamble identifiers dedicated to the new terminal on the scheduling cell are set.

The old terminal can only use the dedicated random access preamble allocated by the base station on the scheduling cell (because the old terminal cannot initiate random access on the scheduled cell), and the new terminal uses the scheduled base station on the cell when the random access preamble is initiated on the scheduling cell. The allocated dedicated random access preamble uses a dedicated random access preamble allocated by the base station on the scheduled cell when initiating a random access preamble on the scheduled cell. After receiving the random access preamble of the old terminal, the base station carries the random access preamble itself as a random access preamble identifier in the sent random access response, and after the base station receives the random access preamble of the new terminal, the base station sends the The random access response carries a random access preamble identifier dedicated to the new terminal. Under the above settings, corresponding to FIG. 4, the terminal 1 and the terminal 4 can be distinguished, and the problem 1 can be solved. The new terminal accesses using a random access preamble on the scheduling cell, and the other new terminal accesses the same random access preamble on the scheduled cell and uses the same access resource, and the base station is in the relevant RAR message. Having a random access preamble identifier RAPID dedicated to the new terminal and using a cell-radio network temporary identifier C-RNTI instead of a temporary cell-radio network temporary identifier TC-RNTI, the two terminals can identify corresponding random access through the C-RNTI response. Corresponding to FIG. 4, the terminal 2 and the terminal 4 can be distinguished, and the second problem is solved.

The new terminal accesses the random access preamble on the scheduled cell, and the other new terminal accesses the same random access preamble on the scheduled cell, and the base station includes the new terminal specific in the related RAR message. A random access preamble identifier RAPID and a cell-radio network temporary identifier C-RNTI are used instead of the temporary cell-radio network temporary identifier TC-RNTI, and the two terminals can identify the corresponding random access response through the C-RNTI. Corresponding to Figure 4, terminal 3 and terminal 4 can be distinguished, and problem three can be solved.

Concrete embodiment 3

The base station sets two dedicated random preamble sets in a dedicated random access preamble set of multiple cells, and sets a primary cell used for the terminal as a terminal to be used for a random access procedure, and a set 2 is used for a random access procedure. The cell is a secondary cell of the terminal and is allocated to the terminal for a random access procedure. The preferred method is that the two sets of configurations of multiple cells are identical.

In the above setting, the terminal that initiates random access in the secondary cell does not use the random access preamble resource dedicated to the random access by the terminal on the primary cell, thereby comparing the identifier and terminal of the random access preamble in the random access response. The identifier of the random access preamble sent when the random access procedure is initiated may distinguish the random access response of the old terminal from the random access response of the random access procedure initiated by the new terminal in the scheduled cell. Corresponding to Fig. 4, the random access response of the terminal 1 and the terminal 3, and the random access response of the terminal 1 and the terminal 4 can be distinguished. The problem is solved.

During the local carrier scheduling access process of the new terminal, the terminal supporting the MTA sends a random access preamble dedicated to the primary cell on the scheduling cell, and the base station sends the traditional random access response to the random access preamble on the scheduling cell. To the new terminal, the RAPID corresponding to the dedicated random access preamble is included in the relevant RAR message in the scheduling cell. And indicating the RAR with the RA-RNTI corresponding to the received random access preamble. The terminal supporting the MTA follows the tradition in the scheduling cell. The RA-RNTI calculation method receives the RAR, and uses the RAPID of the transmitted random access preamble and the RAPID included in the reconciliation RAR. If both information are the same, it can be determined that the RAR message is sent to itself. A terminal that initiates random access by the primary cell does not use the terminal on the secondary cell to initiate a random access preamble resource dedicated to random access. Corresponding to FIG. 4, the terminal 2 and the terminal 3 can be distinguished, and the terminal 2 and the terminal 4 can be distinguished. Question 2 was resolved.

During the cross-carrier scheduling access process, the terminal supporting the MTA sends the dedicated random access preamble of the secondary cell on the scheduled cell, and the base station receives the random access preamble on the scheduled cell to know that the relevant random access response is used for cross- Carrier scheduling, so the scheduling cell includes the RAPID corresponding to the random access preamble in the relevant RAR message and replaces the temporary cell-radio network temporary identifier TC-RNTI with the cell-radio network temporary identifier C-RNTI, and receives the TC-RNTI The RA-RNTI corresponding to the random access preamble indicates the RAR. The MTA-enabled terminal receives the RAR according to the conventional RA-RNTI calculation method on the scheduling cell, and uses the RAPID and C-RNTI of the transmitted random access preamble to check the RAPID and C-RNTI included in the RAR, if both information are the same. , it can be judged that the RAR message is sent to itself. If two new terminals use the same specific random access preamble and the same access time frequency resource to initiate random access on different scheduled cells, as long as the C-RNTI in the RAR is parsed according to the solution of the present invention, It is accurately determined which terminal of the RAR is the RAR in the random access process. Corresponding to Fig. 4, terminal 3 and terminal 4 can be distinguished. The third problem is solved.

The embodiment of the invention also provides the following solution:

The base station includes the identification information in the RA-RNTI identifying the cross-carrier scheduling RAR message. For example, the calculation of the RA-RNTI adds a predetermined offset to the result of the conventional calculation method.

The calculation method including the identifier is

RA-RNTI= 1 + t— id+10*f— id+offset

Where offset is a value corresponding to the access cell, for example, an index of the accessed cell, or a linear combination of parameters such as t-id, f-id, and visited cell index, in order to ensure the calculated The RA-RNTI is not overlapped with the RA-RNTI of the R10 UE existing on the carrier that schedules the RAR, and the RA-RNTI in the random access response of the new terminal accessed by the different access cells is also different. Therefore, the new terminal that is scheduled across carriers can identify the random access response corresponding to the random access procedure itself.

The preferred mode of the index of the access cell here is the index of the identifier SCell on the base station side, for example, the SCelllndex parameter in the LTE/LTE+ technology. Of course, another implementation may use the t-id, f-id, and the index of the identifier Scell on the terminal side, and the calculation is simpler, but the disadvantage of this method is that it may still bring the collision of the RA-RNTI, for example. Terminals using different SCells use the same index to identify the Scell, and the two terminals use the same cell as the PCELL, and the access resource index is the same. In addition, offset can also be set so that the RA-RNTI is calculated and falls within the reserved interval of [FFF4-FFFC].

Meanwhile, the conventional RA-RNTI calculation method is only applicable to PCELL. In the present invention, if the RAR message received by the terminal is not scheduled across carriers, but is scheduled and transmitted on the same SCell, then the calculation method of the RA-RNTI Still use the traditional technology: RA-RNTI = 1 + t - id + 10 * f - id. This has the advantage of reducing terminal costs.

It should be noted that the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other without conflict. It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial Applicability The beneficial effect of the present application is to maintain backward compatibility while satisfying the new version protocol for MTA For the requirement of random access, in the compatible cross-carrier scheduling and local carrier scheduling applications, the terminal supporting MTA and the terminal not supporting MTA can accurately complete the random access process. This solution is of great value to the engineering implementation of the new version of the communication system.

Claims

Claim

A random access method for a multi-carrier system, comprising:

Receiving, by the base station, a random access preamble sent by the terminal;

2. The method of claim 1 wherein

3. The method of claim 2, further comprising:

The base station sets the same part of the dedicated random access preamble resources of each cell as a terminal-specific random access preamble resource supporting a multi-time advance (MTA).

4. The method of claim 1, wherein

The terminal is a terminal supporting an MTA;

The identification information carried in the random access response includes a terminal dedicated to supporting an MTA.

a RAPID, and identification information indicating the terminal.

5. The method of claim 4, further comprising:

6. The method according to any one of claims 2 to 5, wherein

7. The method according to any one of claims 1 to 5, wherein

8. A random access method for a multi-carrier system, comprising:

The terminal sends a random access preamble;

The terminal according to the received random access radio network temporary identifier (RA-RNTI) and The identification information carried by the machine access response identifies the random access response of the terminal.

9. The method of claim 8 wherein

The method of claim 9, wherein the step of the terminal identifying the random access response of the terminal comprises:

11. The method of claim 8, wherein

The terminal is a terminal supporting multiple time advance (MTA);

The method of claim 11, wherein the step of the terminal identifying the random access response of the terminal comprises:

Determining, by the received RA-RNTI, the time-frequency resource of the random access preamble corresponding to the terminal, and the random access preamble identifier carried in the random access response indicated by the RA-RNTI is a terminal-specific RAPID supporting the MTA, and the random When the identifier of the terminal that is carried in the access response is the same as the identifier of the local terminal, it is determined that the random access response indicated by the RA-RNTI is a random access response corresponding to the random access procedure of the terminal.

13. A method according to any one of claims 9 to 12, wherein

A base station device, comprising: a base station side random access process processing module, where The base station side random access procedure processing module is configured to: receive a random access preamble sent by the terminal, and send a random random in a scenario in which a random access radio network temporary identifier (RA-RNTI) is used to indicate a random access response The access response carries identification information for the terminal to identify the random access response of the terminal.

The base station device according to claim 14, wherein

The base station device according to claim 15, wherein

17. The base station device according to claim 14, wherein

The terminal is a terminal supporting an MTA;

18. The base station device according to claim 17, wherein

The base station device according to any one of claims 15 to 18, wherein the identification information of the indication terminal is a cell radio network temporary identifier (C-RNTI).

The base station device according to any one of claims 14 to 18, wherein the base station side random access procedure processing module is configured to receive the random access preamble on the secondary cell, in the primary cell or The random access response is sent on a secondary cell different from the secondary cell that sends the random access preamble.

A terminal, comprising a terminal side random access process processing module, wherein

The terminal side random access procedure processing module is configured to: send a random access preamble in a scenario in which the base station uses a random access radio network temporary identifier (RA-RNTI) to indicate a random access response. The random access response of the terminal is identified according to the received RA-RNTI and the identifier information carried by the random access response.

22. The terminal of claim 21, wherein

23. The terminal of claim 22, wherein

24. The terminal of claim 21, wherein

The terminal is a terminal supporting multiple time advance (MTA);

25. The terminal of claim 24, wherein

The terminal side random access procedure processing module is configured to identify a random access response of the terminal by: determining, by the received RA-RNTI, a time frequency resource corresponding to the terminal sending the random access preamble, the RA-RNTI indication The random access preamble identifier carried in the random access response is a terminal-specific random access preamble identifier that supports the MTA, and when the identifier of the indication terminal carried in the random access response is the same as the local terminal identifier, the RA- is determined. The random access response indicated by the RNTI is a random access response corresponding to the random access procedure of the terminal.

The terminal according to any one of claims 22 to 25, wherein

27. A random access system for a multi-carrier system, comprising the base station device of claim 14, 15, 16, 17, 18, 19 or 20, and the method of claim 21, 22, 23, 24, 25 or 26 The terminal described.