KR20090129458A - A method for uplink scheduling access control - Google Patents

Abstract

The present invention discloses a method for uplink scheduling access control, which includes: (1) Enhanced uplink MAC control entity at UE side configures the transport format, access service class ASC and uplink scheduling information, and configures the random access type as enhanced uplink random access; (2) Enhanced uplink MAC control entity at UE side sends random access request to the physical layer, the request includes said transport format, ASC, random access type and uplink scheduling information; (3) Based on the transport format, ASC, random access type and uplink scheduling information, the physical layer at UE side selects corresponding uplink synchronous code and physical random access channel resources to initiate random access procedure, and sends uplink scheduling information. The present method solves the problem of controlling the uplink scheduling access in enhanced uplink technology.

Description

A METHOD FOR UPLINK SCHEDULING ACCESS CONTROL}

The present invention relates to a wireless communication domain, and more particularly, to an uplink scheduling access control method for a time division duplex system including a time division synchronization code division multiple access system.

Improved uplink service resources in the enhanced uplink technology of the Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) wireless communication system, which is one of the third generation mobile communication system standards. Is assigned by Node B through a scheduling method. If the user equipment (UE) has uplink data to be transmitted through an enhanced uplink scheme, the UE first makes an uplink scheduling request, and then the Node B is authorized to authorize the enhanced uplink service resource. Wait and send. The uplink scheduling connection is a process in which the UE transmits an uplink scheduling request to the Node B in the absence of an authorized uplink service resource. In a TD-SCDMA system, the request process is generally implemented through a random access scheme.

In the TD-SCDMA system, the random access process is completed by joint control of the MAC (Media Access Control) layer and the physical layer. After introducing the enhanced uplink technology, two different entities control different random access requests in the MAC layer, of which MAC-c / sh entity (public / shared MAC layer control entity) is the transport channel RACH ( The Random Access Channel controls the random access request triggered by the Trigger, and the MAC-e entity (enhanced uplink MAC layer control entity) controls the random access request of the uplink scheduling connection.

In the TD-SCDMA system, the random access process further includes two sequential processes, namely an uplink synchronization process and a data transmission process. In the uplink synchronization process, the selection, transmission, and reception of the uplink synchronization code (the uplink synchronization code is sometimes referred to as a signature) is performed by the uplink public channel resources of the random access process, i.e., the physical random access channel. The allocation method of contention sharing for Random Access Channel (PRACH) is shown intensively. Therefore, different uplink synchronization codes may be allocated to the two different random access requests, but they share the same PRACH physical channel resources and their arrangement. When the MAC initiates a random access request, the MAC should transmit a random access type to the physical layer.

In the random access process, different priorities are provided for different service and kinds of random access requests. In a TD-SCDMA system, random access priority is expressed as an access service class, that is, an access service class (ASC). In a TD-SCDMA system, a PRACH physical channel resource having various different attributes can be arranged at the same time, including transmission time intervals. In the random access procedure of the TD-SCDMA system, the ASC and the transport format are generally selected and controlled by the MAC layer entity. When the MAC entity initiates a random access request to the physical layer and triggers a physical layer random access procedure, the MAC entity transmits the selected ASC and transmission format to the physical layer. Subsequently, the physical layer selects a corresponding PRACH physical channel resource according to a transmission format and random access resource arrangement with the ASC and transmits random access information.

In the enhanced uplink technology of the TD-SCDMA system, the physical channel defined for the random access procedure of the uplink scheduling access is an enhanced uplink random access uplink control channel (E-RUCCH). In addition, the corresponding E-RUCCH and the PRACH physical channel defined for the RACH random access share the same physical channel resource and its arrangement, and the arrangement is transmitted through a cell system information broadcast arranged by a radio network controller RNC (Radio Network Controller). Information transmitted to the UE and information transmitted to the Node B through the NBAP are included. However, compared to RACH random access, the random access of the uplink scheduling connection has many floating points. Therefore, in order to implement the control for the random access procedure of the uplink scheduling access, and to share the same PRACH physical channel resources and its arrangement as the RACH random access procedure, a control method for the uplink scheduling connection is required.

An object of the present invention for solving the above problems is uplink scheduling access control for implementing a control for the random access process of the uplink scheduling access available in a time division duplex system including a time division synchronization code division multiple access system. To provide a way.

According to an embodiment of the present invention for achieving the above object,

(1) The enhanced uplink media access control MAC layer control entity on the user equipment UE side places the transport format, access service class ASC and uplink scheduling information of the currently enhanced uplink connection, and selects the random access type for enhanced uplink randomization. Placed in a connection;

(2) an enhanced uplink MAC layer control entity at the UE side initiates a random access request to the physical layer, and includes the transmission format, ASC, random access type and uplink scheduling information in the request;

(3) the physical layer on the UE side selects a corresponding uplink synchronization code and a physical random access channel resource according to a transmission format, an ASC, and a random access type included in the received random access request to initiate a random access procedure, Transmitting uplink scheduling information; It provides an uplink scheduling access control method comprising a.

In a preferred embodiment, the arrangement of the transport format,

Arrange and indicate a transmission format and / or a transmission time interval used for enhanced uplink random access, among system information transmitted by the radio network controller RNC to the UE via cell system information broadcast;

In step (1), the enhanced uplink MAC layer control entity on the UE side may arrange the transmission format into a transmission format indicated by system information or a transmission format having a transmission time interval indicated by system information; It is configured to include.

Further, in the step (1), the arrangement of the transmission format,

The enhanced uplink MAC layer control entity on the UE side selects one transport format to proceed with the rest mode according to the transport format quantity of the random access channel in the UE identifier and system information; or

The enhanced uplink MAC layer control entity on the UE side selects the transmission time interval by performing the remaining operations according to the transmission time interval quantity of the random access channel in the UE indication and system information, and the transmission time interval is provided. Selecting and placing a transport format; It is arranged to include.

The UE beacon is also one or a combination of international mobile user beacons, universal mobile communication system radio network temporary beacons, cell radio network temporary beacons.

Further, in step (1), the enhanced uplink MAC layer control entity on the UE side selects one transport format by itself from among various transport formats having different transmission time intervals in system information.

In addition, the transmission format selection scheme of the enhanced uplink MAC layer control entity on the UE side may be selected by random selection, service-related priority and / or priority of transmission format, and selection of transmission time interval among transmission formats. Or combinations of the foregoing.

In addition, in the step (1), the arrangement of the ASC,

The enhanced uplink MAC layer control entity on the UE side requests the enhanced uplink access request by the MAC logic channel priority MLP of all service logic channels related to the ASC deployed by the cell and this enhanced uplink access request. To finalize the ASC; It includes.

In addition, by comparing the lowest priority ASC in all available ASCs of the present cell with the highest priority MLP in all MLPs of all logical channels, the enhanced uplink MAC layer control entity on the UE side has priority among the two. Selects a relatively high one as the ASC of the enhanced uplink access request.

In addition, the arrangement method of the ASC,

The radio resource control layer places an ASC of this enhanced uplink access request by system information or radio resource control layer message, and the enhanced uplink MAC layer control entity on the UE side in step (1) directly uses the ASC. doing; It includes.

A system using the uplink scheduling access control method is a time division duplex system including a time division synchronization code division multiple access system.

The present invention provides a parameter to be arranged in a random access procedure of uplink scheduling access control and a method of arranging the same, and a method in which the physical layer performs random access procedure control by such a parameter, thereby improving uplink in an uplink technique. We solved the control problem of scheduling access.

1 is a flowchart according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings and specific embodiments, the present invention will be described in detail with respect to the TD-SCDMA system mainly.

As shown in Fig. 1, this embodiment is arranged including the following steps. However, steps 1, 2, and 3 here are for illustrative purposes only, and their order of execution may be reversed, and the order does not represent a strict temporal order.

Step 1: an enhanced uplink MAC layer control entity on the UE side arranges a transmission format of this enhanced uplink connection, among which mainly arranging transmission time intervals;

In the enhanced uplink technology of the TD-SCDMA system, the random access procedure and the RACH random access procedure of the uplink scheduling connection share the same PRACH physical channel resource and its arrangement. Among them, among the information arranged by the RNC and transmitted to the UE through cell system information broadcasting, the arrangement of the PRACH physical channel resources is arranged by the transmission format of the RACH transport channel, and simultaneously the RACH and the corresponding PRACH of various transmission formats Physical channel resources can be deployed. Therefore, in the RACH random access procedure, the enhanced uplink MAC layer control entity on the UE side must select a suitable transmission format based on the deployment information and service data to be launched via the RACH, among which a transmission time interval (TTI) , Transmission block size, transmission block quantity, and the like. However, in the random access of the uplink scheduling connection, that is, the E-RUCCH random access procedure, since there is no service data to be transmitted and the information to be transmitted is scheduling information whose format is fixed and the contents may be different, For RUCCH random access, no corresponding transport format is placed. However, in order to share the same PRACH physical channel resources and arrangements and data transmission processes as the RACH random access procedure in the physical layer, the enhanced uplink MAC layer control entity on the UE side may transmit an E-RUCCH random access request to the physical layer. In this case, the transmission format must be indicated. In the physical layer random access procedure, since control is mainly related to the transmission time interval in the transmission format, in the E-RUCCH random access, it is necessary to truly select and determine the enhanced uplink MAC layer control entity on the UE side. Interval, and then one transmission format is selected according to the transmission time interval and system information arrangement, or when the transmission format is selected, the transmission time interval therein should be the main selection. In the E-RUCCH random access request information transmitted to the physical layer, the transmission block size and the number of transmission blocks in the transmission format do not have a practical meaning and thus may be ignored in the physical layer.

However, since there is no transmission block of service data in the E-RUCCH random access, the transmission format and its transmission time interval cannot be selected according to the transmission block size and quantity. In a transmission format arrangement having various transmission time intervals, an enhanced uplink MAC layer control entity on the UE side may select a transmission format and its transmission time interval for E-RUCCH random access using one of the following methods. .

Method 1: In the system information arranged by the RNC and transmitted to the UE through the cell system information broadcast, in a transmission format having various inter-transmission intervals, arranging one of the transmission formats and the transmission time interval thereof and Instructed to use for E-RUCCH random access. Subsequently, the enhanced uplink MAC layer control entity on the UE side may proceed with E-RUCCH random access by selecting a corresponding transmission format and a corresponding transmission time interval according to system information. Or by placing and indicating only a transmission format or a transmission time interval in the system information, allowing the enhanced uplink MAC layer control entity on the UE side to directly select the corresponding transmission format in the system information, or by the transmission time interval in the system information. It is also possible to select a transmission format provided with a transmission time interval.

Method 2: The enhanced uplink MAC layer control entity on the UE side selects one transmission format or one transmission time interval based on the RACH transmission format quantity or transmission time interval quantity in the UE indication and system information, and Select one transmission format with a transmission time interval. Among them, the UE mark includes an International Mobile Subscriber Identifier (IMSI), a U-RNTI (Universal Mobile System Radio Network Temporary Sign), and a C-RNTI (Cell Radio Network Temporary Sign). Specifically, if N transmission formats have 0, 1... If N-1 is numbered, the transmission format is selected based on the result of IMSI mod N of UE (taken the remainder of IMSI divided by N).

Method 3: The enhanced uplink MAC layer control entity on the UE side selects one transmission format by itself from among transmission formats provided with various different transmission time intervals in system information. The method further comprises random selection; Priority selection by service-related priority and / or transmission format; Length selection by transmission time interval during transmission format; Or a combination of several of the above; And the like. For example, the transmission format having the highest priority may be selected, or the transmission format having the shortest transmission time interval may be selected.

Step 2: The enhanced uplink MAC layer control entity on the UE side deploys the ASC of this enhanced uplink access request. The ASC may be determined by the lowest priority ASC placed by the UE in the enhanced uplink MAC layer control entity on the UE side and the service logic channel priority associated with this enhanced uplink connection request, or RRC (wireless) Resource control) layer may be determined through system information or an RRC message, and is used directly by an enhanced uplink MAC layer control entity on the UE side.

In the TD-SCDMA system, all available ASCs are arranged in the system information of each cell, and the smaller the ASC value, the higher the priority. In the process of establishing / relocating a radio bearer of a radio resource control (RRC) message, one MAC logic channel priority (MLP) is allocated to each service logic channel. And, since the uplink scheduling connection is associated with a certain service and may include several logical channels, the enhanced uplink MAC layer control entity on the UE side may select the ASC of the enhanced uplink connection request based on the two deployment information. You can decide. For example, if two batches of priority information are comparable (so-called comparability, that is, the definitions and values of the two priorities are the same and the methods are the same, but they are generally used differently). Defined by different concepts), the lowest priority ASC in all available ASCs and the highest priority MLP in all MLPs of all logic channels are enhanced by selecting a relatively high priority ASC of an uplink connection request. The RRC layer may also place the ASC used for the enhanced uplink access request for the UE through system information or the RRC message, and allow the enhanced uplink MAC layer control entity on the UE side to use the ASC directly.

Step 3: The enhanced uplink MAC layer control entity on the UE side places the random access type as the enhanced uplink random access and places uplink scheduling information.

In a TD-SCDMA system, different uplink synchronization codes are placed for the two different random access requests, but they share the same PRACH physical channel resources and their arrangement. Therefore, the MAC should transmit the random access type to the physical layer at the start of the random access request.

The random access request message transmitted to the physical layer must include uplink scheduling information (SI) to be transmitted in the E-RUCCH random access procedure, in addition to the transmission format, the ASC and the random access type. The uplink scheduling information is arranged by the enhanced uplink MAC layer control entity on the UE side.

Step 4: The enhanced uplink MAC layer control entity on the UE side initiates a random access request to the physical layer. The request message includes the selection decision and the placement in steps 1, 2 and 3.

Step 5: The physical layer on the UE side selects a corresponding uplink synchronization code and a PRACH physical resource according to a transmission format, an ASC, and a random access type, and initiates a random access procedure to transmit uplink scheduling information.

After receiving the random access request, the physical layer on the UE side selects a corresponding uplink synchronization code and a PRACH physical resource according to the transmission format, ASC, random access type and system configuration information in the request message to initiate a random access procedure. do. The random access procedure is similar to the random access procedure before introducing the enhanced uplink technology in the TD-SCDMA system of the 3rd generation mobile communication partner project (3GPP) standard.

The arrangement information of the system information used in the MAC layer and the physical layer on the UE side is all arranged by the RRC layer on the UE side in the MAC layer and the physical layer after receiving the system information.

Given the similarity of the enhanced uplink technology, the method of the present invention is also applicable to the enhanced uplink technology of other systems in the current 3GPP standard, for example, 3.84 Mcps TDD (Time Division Duplex System), 7.68 Mcps TDD System. And so on.

The present invention provides a parameter to be arranged in a random access procedure of uplink scheduling access control and a method of arranging the same, and a method in which the physical layer performs random access procedure control by such a parameter, thereby improving uplink in an uplink technique. We solved the control problem of scheduling access.

Claims (10)

(1) The enhanced uplink media access control MAC layer control entity on the user equipment UE side places the transport format, access service class ASC, and uplink scheduling information for this enhanced uplink connection, and selects the random access type for enhanced uplink randomization. Placed in a connection; (2) an enhanced uplink MAC layer control entity at the UE side initiates a random access request to the physical layer, and includes the transmission format, ASC, random access type and uplink scheduling information in the request; (3) the physical layer on the UE side selects a corresponding uplink synchronization code and a physical random access channel resource according to a transmission format, an ASC, and a random access type included in the received random access request to initiate a random access procedure, Transmitting uplink scheduling information; Uplink scheduling connection control method comprising a. The method of claim 1, The arrangement of the transmission format, Arrange and indicate a transmission format and / or a transmission time interval used for enhanced uplink random access, among system information transmitted by the radio network controller RNC to the UE via cell system information broadcast; In step (1), the enhanced uplink MAC layer control entity on the UE side may arrange the transmission format into a transmission format indicated by system information or a transmission format having a transmission time interval indicated by system information; Uplink scheduling access control method comprising a. The method of claim 1, In the step (1), the arrangement of the transmission format, The enhanced uplink MAC layer control entity on the UE side selects one transport format to proceed with the rest of the operation according to the transmission format quantity of the random access channel in the UE indication and system information; or The enhanced uplink MAC layer control entity on the UE side selects one transmission time interval by performing the remaining operations according to the transmission time interval quantity of the random access channel in the UE indication and system information, and the corresponding transmission time interval is provided. Selecting and placing a transport format; Uplink scheduling access control method comprising a. The method of claim 3, And the UE indication is one or a combination of an international mobile user indication, a universal mobile communication system wireless network temporary indication, and a cell wireless network temporary indication. The method of claim 1, In step (1), the uplink MAC layer control entity on the UE side selects one transmission format by itself from among various transmission formats having different transmission time intervals in system information. Link Scheduling Connection Control Method. The method of claim 5, The transmission format selection scheme of the enhanced uplink MAC layer control entity on the UE side may include random selection, selection based on service related priority and / or transmission format priority, selection by transmission time interval length among transmission formats, or Uplink scheduling connection control method characterized in that a combination of several methods. The method of claim 1, In step (1), the arrangement of the ASC is the MAC logic channel of the enhanced uplink MAC layer control entity on the UE side, the ASC disposed by the cell and all service logic channels related to this enhanced uplink access request. Determining, by the priority MLP, the ASC of this enhanced uplink connection request; Uplink scheduling access control method comprising a. The method of claim 7, wherein By comparing the lowest priority ASC in all available ASCs of the cell with the highest priority MLP in all MLPs of all logical channels, the enhanced uplink MAC layer control entity on the UE side has priority among the two. And select one of the higher relative values as the ASC of the enhanced uplink access request. The method of claim 1, In the arrangement of the ASC, the radio resource control layer arranges the ASC of the enhanced uplink access request by the system information or the radio resource control layer message, and the enhanced uplink MAC layer control on the UE side in step (1). The uplink scheduling access control method, characterized in that the entity uses the ASC directly. The method according to any one of claims 1 to 9, A system using the uplink scheduling access control method is a time division duplex system including a time division synchronization code division multiple access system.

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