KR20060097496A - Wireless access communication system for performing ranging stage and subscriber station and base station therefor and method therein - Google Patents

Wireless access communication system for performing ranging stage and subscriber station and base station therefor and method therein Download PDF

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Publication number
KR20060097496A
KR20060097496A KR1020050019854A KR20050019854A KR20060097496A KR 20060097496 A KR20060097496 A KR 20060097496A KR 1020050019854 A KR1020050019854 A KR 1020050019854A KR 20050019854 A KR20050019854 A KR 20050019854A KR 20060097496 A KR20060097496 A KR 20060097496A
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South Korea
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rng
terminal
base station
req message
req
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KR1020050019854A
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Korean (ko)
Inventor
도경태
박윤상
임애리
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삼성전자주식회사
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Priority to KR1020050019854A priority Critical patent/KR20060097496A/en
Publication of KR20060097496A publication Critical patent/KR20060097496A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43KIMPLEMENTS FOR WRITING OR DRAWING
    • B43K29/00Combinations of writing implements with other articles
    • B43K29/08Combinations of writing implements with other articles with measuring, computing or indicating devices
    • B43K29/093Combinations of writing implements with other articles with measuring, computing or indicating devices with calculators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43KIMPLEMENTS FOR WRITING OR DRAWING
    • B43K24/00Mechanisms for selecting, projecting, retracting or locking writing units
    • B43K24/02Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
    • B43K24/08Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions operated by push-buttons
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06CDIGITAL COMPUTERS IN WHICH ALL THE COMPUTATION IS EFFECTED MECHANICALLY
    • G06C1/00Computing aids in which the computing members form at least part of the displayed result and manipulated directly by hand, e.g. abacus, pocket adding device

Abstract

In the radio access communication system according to the present invention, the base station allocates a predetermined uplink resource, which may include at least a basic TLV element, to the terminal when allocating the resource to CDMA_Allocation_IE. That is, the base station allocates the amount of uplink resources as the amount of resources capable of transmitting the basic information of the terminal.
If the terminal is not enough to transmit the RNG-REQ message to be allocated the amount of uplink resources, the terminal transmits an RNG-REQ message containing at least basic information to the base station, in order to request a bandwidth for additional transmission For example, "Ranging status indication" information is added to the RNG-REQ message to inform the base station that the UE requires additional RNG-REQ transmission.
Ranging procedure, ranging code

Description

WIRELESS ACCESS COMMUNICATION SYSTEM FOR PERFORMING RANGING STAGE AND SUBSCRIBER STATION AND BASE STATION THEREFOR AND METHOD THEREIN}

1 is a block diagram illustrating a general broadband wireless communication system;

2 is a view showing an initial initial ranging procedure of a terminal in a broadband wireless access communication system,

3 is a view showing the contents of an RNG-REQ message;

4 is a diagram illustrating the contents of a bandwidth request message;

5 is a diagram illustrating a message flow during a ranging procedure between a base station and a terminal according to the first embodiment of the present invention;

6 illustrates the contents of a bandwidth request message according to an embodiment of the present invention;

7 illustrates the contents of a CDMA_Allocation_IE message according to an embodiment of the present invention;

8 is a diagram illustrating a message flow in a ranging procedure between a base station and a terminal according to a second embodiment of the present invention;

9 is a diagram illustrating a format of an RNG-REQ message according to an example of a second embodiment of the present invention;

FIG. 10 is a view showing the contents of a Type field of a header of the RNG-REQ message of FIG. 9; FIG.

11 illustrates a format of an RNG-REQ message according to another example of the second embodiment of the present invention;

12 is a view showing payload contents of an RNG-REQ message of FIG. 11;

13 is a diagram illustrating a message flow in a ranging procedure between a base station and a terminal according to a third embodiment of the present invention;

14 is a diagram illustrating information that may be included in an RNG-RSP message upon initial network entry and information that may be included in an RNG-RSP message during handoff.

15 is a block diagram of a terminal 10 according to an embodiment of the present invention;

16 is a block diagram of a base station 20 according to an embodiment of the present invention.

The present invention relates to a wireless access communication system for performing a ranging procedure, and a terminal and a base station therefor.

Hereinafter, embodiments of the present invention will be described by applying to an 802.16 OFDMA system.

1 is a diagram illustrating a configuration of a general broadband wireless access communication system. Referring to FIG. 1, a subscriber station (SS) 10 is generally mobile and connected to a backbone network 30 through a base station (BS) 20. The terminal 10 allows access between the base station 20 and the subscriber. The base station 20 provides control, management, and connectivity to the terminal 10. The backbone network 30 is connected to an authentication and service authorization server (ASA) 40 for authentication and service authentication of the terminal 10.

In addition, the terminal 10 needs to successfully complete a network entry process with a predetermined base station 20 in order to communicate on a broadband wireless access communication system. The network entry process involves downlink (DL) channel synchronization, initial ranging, capabilities negotiation, authentication message exchange, registration and IP connectivity steps ( stages). When the network entry process is completed, the terminal 10 generates one or more service flows and transmits data to the base station 20. An initial ranging step in this network entry process will be described with reference to FIG. 2.

2 is a diagram illustrating an initial ranging procedure of a terminal in a broadband wireless access communication system. The terminal 10 first transmits an initial ranging code to the base station in a competitive manner in step 101. Such code ranging enables the uplink timing and power offset adjustment of the terminal to be performed. The base station 20 broadcasts by displaying the code ranging information and the power offset adjustment value transmitted by the terminal in the RNG-RSP message in step 103. Upon receiving the RNG-RSP message, the terminal 10 checks the code ranging information and adjusts the power offset. When the status field of the RNG-RSP message is continue, the terminal 10 retries the code ranging in step 105.

When the base station 20 determines that timing and power adjustment are performed through code ranging attempted by the terminal, the base station 20 transmits the status field of the RNG-RSP message as success in step 107. The base station 20 allocates and applies an uplink interval (UL bandwidth) through which the UE can transmit an RNG-REQ message through the UL-MAP having the CDMA_Allocation_IE. The CDMA_Allocation_IE includes the amount of uplink resources allocated to the terminal together with the code ranging information transmitted by the terminal 10. Then, if the status field of the RNG-RSP message is success, the terminal 10 finishes code ranging and attempts message ranging.

On the other hand, the terminal 10 transmits the RNG-REQ message in the allocated uplink period in step 111, and the ranging procedure is completed when the RNG-RSP message is received from the base station in step 113. Through the ranging procedure, the terminal is assigned a basic CID such as a Basic CID (Connection Identifier) and a Primary CID. The CID is a value uniquely assigned to the terminal by the base station and becomes information for identifying the terminal during access of the base station. There are several types of information transmitted through the RNG-REQ message, including the MAC address information of the terminal. The base station responds to the RNG-RSP after viewing the information. The UE transmits a capability request message (SBC (SS Basic Capability) -REQ) to perform a capability negotiation procedure in step 115 through the basic CID and the primary CID included in the RNG-RSP.

The information that an RNG-REQ message can contain is included in Type-Length-Value (TLV) encodings, and the size of an RNG-REQ message is also different because the information contained in one RNG-REQ message may vary depending on the implementation or situation. Can vary.

However, at the time of transmitting the RNG-REQ, that is, the terminal has not been allocated any unique CID until the RNG-RSP is received, the bandwidth allocation cannot be requested to the base station 20 using the bandwidth request header (message). When the RNG-REQ message of the terminal 10 is not received in the allocated uplink period, the base station 20 may not determine whether the terminal 10 has not attempted transmission due to packet loss. Accordingly, the terminal 10 performs code ranging again and receives CDMA_Allocation_IE from the base station 20 to transmit the RNG-REQ message. Even in this case, since there is no guarantee that the base station allocates sufficient resources through CDMA_Allocation_IE, the problem of RNG-REQ message transmission remains.

Accordingly, the present invention solves a problem that occurs when the allocated uplink resources are insufficient at the ranging attempt.

The present invention can not only support an efficient network entry procedure of the terminal, but can also solve the problem of the initial network entry procedure that may occur in the current IEEE 802.16 and 802.16e standards.

To this end, the present invention relates to an uplink wireless access supported by a broadband wireless access communication system, and proposes an efficient method for a terminal to enter an initial network. When the terminal enters the initial system, uplink synchronization and power control are performed through code ranging. After successfully ranging the code, the terminal is allocated an interval for transmitting the RNG-REQ message from the base station, and can perform network access through the message ranging of the RNG-REQ / RSP. However, when the uplink resources allocated by the base station for message ranging of the terminal are not sufficient, the terminal cannot transmit the RNG-REQ message, which causes a problem. In the current standards of IEEE 802.16 and 802.16e, in this case, the base station does not know that the uplink resource allocated to the terminal is insufficient. Therefore, the terminal should try to code ranging again. The present invention provides several ways to overcome this limitation.

Embodiments of the present invention may be applied to a high speed wireless Internet network.

Hereinafter, the present embodiment will be described as using CDMA_Allocation_IE, but any type of message format may be used so that the UE can know that the information is allocated uplink resources for ranging.

3 is a diagram illustrating the contents of an RNG-REQ message, and FIG. 4 is a diagram illustrating the contents of a Bandwidth Request message.

3 shows information that may be included in the RNG-REQ message, where the message type 201, the downlink channel ID 203, the Request Downlink Burst Profile 205, and the SS MAC Address 207 are necessarily RNG-REQ messages. It is included in, but may not contain other values.

Referring to FIG. 3, during initial ranging, the UE generates an RNG-REQ message including a TLV field such as a Requested Downlink Burst Profile and an SS MAC Address, and requests Requested Downlink Burst Profile, Ranging Anomalies, and AAS (Adaptive Antena System) broadcast. A TLV field such as capability may be included in the RNG-REQ message. The base station considers all possible TLVs to allocate uplink resources to the terminal.

Referring to FIG. 3, fields such as Serving BS ID, Ranging Purpose Indication, Location Update Request, and Paging Controller ID are included in the RNG-REQ message during handover ranging, and the UE includes HO ID, Power down Indicatior, and Power Saving Class. It can include fields such as Parameters Proposed Changes. The base station then allocates uplink resources for all possible TLVs.

The base station 20 randomly allocates an uplink interval through the CDMA_Allocation_IE after the code ranging of the terminal 10 succeeds. The allocated resource may be insufficient according to the amount of information of the RNG-REQ message that the terminal wants to send.

According to the first embodiment, the terminal transmits a bandwidth request including an initial ranging CID to the base station when the uplink resource allocated by the base station for message ranging of the terminal is not sufficient. In this case, the base station determines that the terminal requests the bandwidth request during the ranging process, and reassigns the uplink interval through CDMA_Allocation_IE. In this case, since sufficient uplink resources may be allocated through the bandwidth request information requested by the UE, the UE may successfully perform message ranging by transmitting an RNG-REQ message and receiving an RNG-RSP.

According to the second embodiment, the base station allocates a predetermined uplink resource, which may include at least a basic TLV element, to the terminal when allocating the resource with CDMA_Allocation_IE to the terminal that has successfully completed the code ranging. That is, the base station allocates the amount of uplink resources as the amount of resources capable of transmitting the basic information of the terminal.

If the terminal is not enough to transmit the RNG-REQ message to be allocated the amount of uplink resources, the terminal transmits an RNG-REQ message containing at least basic information to the base station, in order to request a bandwidth for additional transmission For example, "Ranging status indication" information is added to the RNG-REQ message to inform the base station that the UE requires additional RNG-REQ transmission. This "Ranging status indication" information may be included in the RNG-REQ message through a TLV field or piggyback request such as "Requested Bandwidth for next ranging request". When the base station receives the RNG-REQ message including the minimum information, the base station allocates a basic CID to the terminal. In addition, the base station determines that there is additional information according to the ranging procedure for the piggyback request transmitted by the terminal and allocates uplink resources to the terminal.

According to the third embodiment, when a base station allocates resources through CDMA_Allocation_IE to a terminal that successfully completes code ranging, the base station determines an amount of uplink resources according to a condition of whether to allocate uplink resources and allocates a sufficient amount of resources. . Such conditions include, for example, code set information and ranging interval information of a CDMA code transmitted by a terminal. Accordingly, the terminal almost never runs out of uplink resources for transmitting the RNG-REQ message.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. First, a laminating procedure between a base station and a terminal according to the first embodiment of the present invention will be described with reference to FIGS. 5 to 7.

5 is a diagram illustrating a message flow in a ranging procedure between a base station and a terminal according to the first embodiment of the present invention, and FIG. 6 is a diagram illustrating contents of a bandwidth request message according to an embodiment of the present invention. 7 is a diagram illustrating contents of a CDMA_Allocation_IE message according to an embodiment of the present invention.

Referring to FIG. 5, the terminal 10 transmits a bandwidth request including an initial ranging CID to the base station 20 when there is not enough uplink resource allocated by the base station 20 for message ranging of the terminal 10. Send.

In more detail, the terminal 10 transmits an initial ranging code to the base station 20 in a competitive manner in step 301. In step 303, the base station 20 broadcasts the code ranging information and the power offset adjustment value transmitted by the terminal in the RNG-RSP message. At this time, the base station 20 marks the status field of the RNG-RSP message as success if it is determined that timing and power adjustment is performed through code ranging attempted by the terminal, and if it is determined that more code ranging is necessary, Send the status field marked continue.

Accordingly, the terminal 10 retries code ranging in step 305 when the status field of the RNG-RSP message received in step 303 is continue. When the base station 20 determines that timing and power adjustment are performed through the code ranging attempted by the terminal, the base station 20 transmits the status field of the RNG-RSP message as success in step 307. At the same time, the base station 20 transmits a UL-MAP such as CDMA_Allocation_IE to the terminal 10 in step 309. In CDMA_Allocation_IE, the amount of uplink resources allocated to the terminal is indicated together with the code ranging information transmitted by the terminal. When the terminal 10 wants to transmit the RNG-REQ message to attempt message ranging, if the allocated uplink resource is insufficient, the terminal 10 transmits the bandwidth request header as shown in FIG. 6 in the corresponding uplink period in step 311. . Referring to FIG. 6, the bandwidth request header according to an embodiment of the present invention uses an initial ranging CID in the CID field. That is, when the allocated uplink resource is insufficient, the terminal 10 transmits a bandwidth request header including an initial ranging CID to the base station 20.

When the base station receives the bandwidth request header including the initial ranging CID, the base station determines the bandwidth request to request uplink resources in the ranging process, and reassigns the uplink interval through CDMA_Allocation_IE. In this case, since sufficient uplink resources can be allocated through the bandwidth request information requested by the UE, the UE can successfully perform message ranging by transmitting an RNG-REQ message and receiving an RNG-RSP.

At this time, the base station 20 indicates a ranging code (eg, 0x00) in the CDMA_Allocation_IE as a predetermined code, for example, 0x00. And the base station 20 indicates a symbol for receiving the bandwidth request header and a subchannel for each CDMA_Allocation_IE ranging symbol. And ranging subchannels. That is, since the base station 20 cannot know the terminal 10 requesting the bandwidth, the terminal 10 transmits CDMA_Allocation_IE at the ranging symbol and the ranging subchannel position where the terminal 10 transmits the bandwidth request header. Accordingly, the UE 10 may view the ranging code and recognize that the corresponding CDMA_Allocation_IE is for allocating a bandwidth for the RNG-REQ. The terminal 10 may identify the CDMA_Allocation_IE transmitted in response to the bandwidth request header transmitted by the terminal 10 based on the ranging symbol and the ranging subchannel location.

In other words, when the ranging code value is 0x00, the terminal 10 having received the CDMA_Allocation_IE determines that the terminal 10 is the allocation information for the bandwidth request through the initial-ranging CID. In addition, the terminal 10 compares the ranging symbol and the ranging subchannel value with the same location from which the bandwidth request header was sent. If the ranging code value is 0x00 and the ranging symbol and the ranging subchannel value of the CDMA_Allocation_IE are the same as the location where the bandwidth request header is sent, the terminal 10 transmits its RNG-REQ message to the allocated section in step 317. do. The CDMA_Allocation_IE according to the embodiment of the present invention shown in FIG. 7 uses the format of the existing CDMA_Allocation_IE as it is. According to the present embodiment, the terminal 10 looks at the ranging code value and identifies whether the values included in the CDMA_Allocation_IE are for ranging or bandwidth allocation.

When the terminal 10 receives the RNG-RSP message from the base station 20 in step 319, the ranging procedure ends. In step 321, the terminal 10 transmits a capability request message (SBC (SS Basic Capability) -REQ) to perform a capability negotiation procedure.

As such, when the base station receives the bandwidth request header including the initial ranging CID, the base station determines that the bandwidth request is requested during the ranging process and reassigns the uplink interval through CDMA_Allocation_IE. In this case, since sufficient uplink resources may be allocated through the bandwidth request information requested by the UE, the UE may successfully perform message ranging by transmitting an RNG-REQ message and receiving an RNG-RSP.

In addition, the present invention can be applied to any other type of CID as well as the initial ranging CID as the CID included in the bandwidth request header.

Next, with reference to Figures 8 to 10, the laminating procedure between the base station and the terminal according to a second embodiment of the present invention.

8 is a diagram illustrating a message flow in a ranging procedure between a base station and a terminal according to the second embodiment of the present invention.

Referring to FIG. 8, the base station 20 allocates a minimum amount of uplink resources to the terminal 10 to transmit at least essential TLV information when allocating resources with CDMA_Allocation_IE to the terminal 10 that has successfully completed code ranging.

In more detail, the terminal 10 transmits an initial ranging code to the base station 20 in a competitive manner in step 401. In step 403, the base station 20 broadcasts the code ranging information and the power offset adjustment value transmitted by the terminal in the RNG-RSP message. When the status field of the RNG-RSP message received in step 403 is continue, the terminal 10 retries code ranging in step 405. When the base station 20 determines that timing and power adjustment have been made through the code ranging attempted by the terminal, the base station 20 transmits the status field of the RNG-RSP message as success in step 407.

In step 409, the base station 20 transmits, to the UE, CDMA_Allocation_IE to which an uplink resource capable of transmitting basic information is allocated. For example, the base station 20 is a message type 201, downlink channel ID 203, Request Downlink Burst Profile 205, SS MAC Adress 207 as ranging information necessary in the RNG-REQ message shown in FIG. Transmits the CDMA_Allocation_IE to which the downlink resource which can carry at least is transmitted to the terminal 10.

That is, the base station 20 allocates uplink resources of "Minimum resource for Ranging Request" or more to the terminal 10 that has completed the successful code ranging through CDMA_Allocation_IE. At this time, "Minimum resource for Ranging Request" refers to the amount of uplink resources that can support the RNG-REQ message including the minimum information, such as MAC header, Grant subheader, MAC address of the terminal.

In step 411, the terminal 10 transmits an RNG-REQ message including at least basic information to the base station. In this case, if there is additional RNG-REQ information to be transmitted to the base station 20, the terminal 10 indicates the presence of the additional RNG-REQ information or the bandwidth allocation request in the RNG-REQ message. That is, when the allocated uplink resource amount is not sufficient to transmit the RNG-REQ message to be transmitted, the terminal 10 requests, for example, a "Ranging status indication" in the RNG-REQ message to request bandwidth for additional transmission. The information is added to inform the base station that the terminal requires additional RNG-REQ transmission. This "Ranging status indication" information may be included in the RNG-REQ message through a TLV field or piggyback request such as "Requested Bandwidth for next ranging request". In other words, the indication of the bandwidth allocation request or the presence of additional RNG-REQ information includes a method of including a piggyback request for bandwidth allocation request in the RNG-REQ message, and a TLV (for bandwidth allocation request in the payload of the RNG-REQ message). You can add a Type-Length-Value) field. The second embodiment is not limited thereto and may indicate a bandwidth allocation request in the RNG-REQ message in any manner that can be implemented by those skilled in the art.

When the piggyback request for bandwidth allocation request is included in the RNG-REQ message, the format of the RNG-REQ message transmitted to the base station is illustrated in FIG. 9. Referring to FIG. 9, the RNG-REQ message 430 includes a header 431, a subheader 433, and a payload 435. Since downlink resources are allocated to carry only the minimum information in the RNG-REQ message, the terminal 10 includes minimum information (such as MAC address) and piggyback (bandwidth) request if there is more ranging information to be transmitted in addition to the required ranging information. Send an RNG-REQ message on the uplink. The piggyback request is for requesting a bandwidth for the UE to additionally transmit information according to a ranging procedure to the BS. In order to indicate the presence of such a subheader, as shown in FIG. 10, a value 470 indicating the existence of a piggyback request exists in the Type field of the header 31.

The format of the RNG-REQ message transmitted to the base station when a TLV (Type-Length-Value) field for bandwidth allocation request is added to the payload of the RNG-REQ message is shown in FIG. 11. 12 shows the contents of the payload of the RNG-REQ message of FIG. Referring to FIG. 11, the RNG-REQ message 440 includes a header 441 and a payload 443. If there is more ranging information to be transmitted in addition to the required ranging information, the terminal 10 uplinks the RNG-REQ message including minimum information (MAC address, etc.) and a TLV (Type-Length-Value) 450 for a bandwidth allocation request. To send. A TLV (Type-Length-Value) value 450 for the bandwidth allocation request may be added to the payload 443 of the RNG-REQ message as shown in FIG. 12 and may be called Requested Bandwidth for next ranging request. Can be. And the size of the type-length-value (TLV) 450 for the bandwidth allocation request can be appropriately determined by those skilled in the art.

Receiving the RNG-REQ message, the base station 20 allocates a basic CID through the minimum information (MAC address, etc.) of the terminal in step 413 and responds to the terminal with the RNG-RSP. In this case, when the terminal 10 transmits a piggyback request or when the terminal 10 transmits a TLV (Type-Length-Value) value for a bandwidth allocation request, the base station 20 receives additional information of Ranging in step 415. It determines that there is, and allocates uplink resource using Basic CID. Accordingly, the terminal 10 additionally transmits the RNG-REQ message through the basic CID in the uplink period allocated in step 417 and receives the RNG-RSP for it from the base station 20 in step 419.

Next, with reference to Figures 3, 13 and 14, the laminating procedure between the base station and the terminal according to a third embodiment of the present invention will be described.

13 is a diagram illustrating a message flow during a ranging procedure between a base station and a terminal according to a third embodiment of the present invention. A diagram showing information that may be included in the.

When the base station 20 allocates resources to the terminal 10 that has successfully completed code ranging through CDMA_Allocation_IE, the base station 20 determines the amount of uplink resources according to a criterion of how much uplink resources are allocated and allocates uplink resources. . .

In more detail, the terminal 10 transmits an initial ranging code to the base station 20 in a competitive manner in step 501. In step 503, the base station 20 broadcasts the code ranging information and the power offset adjustment value transmitted by the terminal in the RNG-RSP message. The terminal 10 retries code ranging in step 505 when the status field of the RNG-RSP message received in step 503 is continue. When the base station 20 determines that the timing and power adjustment are properly performed through the code ranging attempted by the terminal, the base station 20 transmits the status field of the RNG-RSP message as success in step 507.

The base station 20 determines the amount of uplink resources according to a condition of how much uplink resources are allocated in step 509. One of the main conditions that govern the size of the RNG-REQ message is whether the RNG-REQ message is for initial network entry or network reentry following handoff. This condition may be determined by the base station 20 through, for example, a raging code. The initial ranging codeset and the ranging codeset for handover are defined differently from each other, and the uplink contention interval for each ranging is also allocated differently. Therefore, the base station can determine the access state of the terminal through the ranging code and the interval information transmitted by the terminal, and determines the uplink resources to be allocated accordingly. FIG. 14 shows information that may be included in an RNG-RSP message upon initial network entry and information that may be included in an RNG-RSP message during handoff according to these conditions. The base station 20 determines a sufficient amount of uplink resources so that the terminal 10 can send all ranging information (All TLV elements) to be transmitted to the base station 20 based on these conditions.

For example, during initial ranging, the terminal generates an RNG-REQ message, which includes a TLV field such as a Requested Downlink Burst Profile and an SS MAC Address. In addition, a TLV field such as Requested Downlink Burst Profile, Ranging Anomalies, and Adaptive Antena System (AAS) broadcast capability may be included in the message (see FIG. 3). With this generated RNG-REQ message, the base station may determine a sufficient amount of uplink resources to give the terminal in consideration of all possible TLVs for allocating UL bandwidth of the terminal. For example, during handover ranging, the terminal may include fields such as Serving BS ID, Ranging Purpose Indication, Location Update Request, and Paging Controller ID in generating the RNG-REQ message. In addition, fields such as HO ID, Power down Indicator, and Power Saving Class Parameters Prosed Changes may be included (see FIG. 3). Based on the generated RNG-REQ message, the base station may determine a sufficient amount of uplink resources to allocate to the terminal in consideration of all possible TLVs for allocating UL bandwidth of the terminal.

Accordingly, the terminal almost never runs out of uplink resources for transmitting the RNG-REQ message.

Subsequently, the base station 20 transmits the CDMA_Allocation_IE to which the uplink resource is allocated in step 511 to the terminal 10. Then, the terminal 10 transmits an RNG-REQ message in the uplink period allocated in step 513. According to the present embodiment, the terminal 10 does not need a bandwidth for transmitting the RNG-REQ message to the base station 20 because the uplink resources allocated from the base station 20 are sufficient.

The base station 20 ends the ranging procedure by transmitting an RNG-RSP message to the terminal 10 in step 515. In addition, the terminal 10 transmits a capability request message (SBC (SS Basic Capability) -REQ) to perform a capability negotiation procedure in step 517 through the basic CID and the primary CID included in the RNG-RSP. .

Next, the configuration and operation of the terminal and the base station implementing the first to third embodiments will be described.

15 is a block diagram of a terminal 10 according to an embodiment of the present invention. Referring to FIG. 15, the terminal 10 includes a transceiver 12 and a controller 14. The transceiver 14 receives or transmits a message for a ranging procedure. The controller 14 transmits a bandwidth request including an initial ranging CID to the base station through the transceiver 12 when there is not enough uplink resource allocated to transmit the RNG-REQ message according to the first embodiment. When the ranging code value of the CDMA_Allocation_IE transmitted from the base station 20 is, for example, 0x00, the controller 14 determines that the allocation information is about bandwidth request through an initial-ranging CID. Then, the controller 14 compares the lasing symbol of the CDMA_Allocation_IE with the lasing subchannel value to the same position where the lasing subchannel value is sent. If the ranging code value is, for example, 0x00 and the Ranging symbol of the CDMA_Allocation_IE and the ranging subchannel value are the same as the location where the bandwidth request header is sent, the controller 14 transmits and receives the RNG-REQ message of its own in the allocated section. 12) is transmitted to the base station 20.

If the allocated uplink resource amount is not sufficient to transmit the RNG-REQ message to be transmitted, the controller 14 requests a bandwidth for additional transmission according to the second embodiment. The RNG-REQ message including the TLV field or the piggyback request is transmitted to the base station through the transceiver 12. As described above, the indication of the bandwidth allocation request or the presence of the additional RNG-REQ information includes a method of including a piggyback request for the bandwidth allocation request in the RNG-REQ message, and a bandwidth allocation request in the payload of the RNG-REQ message. There is a method of adding a Type-Length-Value (TLV) field. If there is additional RNG-REQ information to be transmitted to the base station, the controller 14 may generate an RNG-REQ message including a piggyback request and transmit it to the base station 20. Alternatively, the controller 14 may generate an RNG-REQ message including a “Requested Bandwidth for next ranging request” for the bandwidth allocation request and transmit the generated RNG-REQ message to the base station 20.

Subsequently, the controller 14 additionally transmits the RNG-REQ message through the Basic CID when the Basic CID is allocated from the base station 20 through the RNG-RSP.

Of course, if the amount of uplink resources initially allocated from the base station is sufficient, the controller 14 may transmit all ranging information to be transmitted to the base station 20 by transmitting the RNG-REQ message only once.

16 is a block diagram of a base station 20 according to an embodiment of the present invention. Referring to FIG. 16, the base station 20 includes a transceiver 22, a controller 24, and an uplink resource allocator 26. The transceiver 24 receives or transmits a message for a ranging procedure. According to the first embodiment, when the controller 24 receives a bandwidth request including an initial ranging CID, the controller 24 determines that the terminal is a bandwidth request requested by the ranging process. Accordingly, the uplink resource allocator 26 reassigns the uplink interval through CDMA_Allocation_IE. At this time, when the CDMA_Allocation_IE is transmitted in response to the bandwidth request, the controller 24 transmits the CDMA_Allocation_IE at the location of the ranging symbol and the ranging subchannel receiving the bandwidth request.

According to the second embodiment, the uplink resource allocator 26 allocates a minimum amount of uplink resources when allocating uplink resources through CDMA_Allocation_IE to a terminal that successfully completes code ranging. That is, the uplink resource allocator 26 allocates uplink resources of the minimum resource for Ranging Request or more to the terminal 10 that has completed the successful code ranging through the CDMA_Allocation_IE. At this time, "Minimum resource for Ranging Request" refers to the amount of uplink resources that can support the RNG-REQ message including the minimum information, such as MAC header, Grant subheader, MAC address of the terminal.

When the control unit 24 receives the RNG-REQ message from the terminal, the control unit 24 transmits the RNG-RSP to which the Basic CID is allocated through the minimum information (MAC address, etc.) of the terminal. In addition, the controller 24 determines whether the presence of additional RNG-REQ information or a bandwidth allocation request for transmission thereof is indicated in the RNG-REQ message received from the terminal 10. For example, the controller 24 determines whether a piggyback request or a requested bandwidth for next ranging request is included in the received RNG-REQ message. If the RNG-REQ message includes an indication of the presence of additional RNG-REQ information or an indication of a bandwidth allocation request, the control unit 24 causes the uplink resource allocation unit 26 to uplink to the terminal 10 using the Basic CID. Reassign resources.

Finally, according to the third embodiment, when the uplink resource allocator 26 allocates resources to the terminal that has successfully completed the code ranging through CDMA_Allocation_IE, the amount of uplink resources according to the condition of how much uplink resources are allocated. And allocate uplink resources. As described above, one of the main conditions that determine the size of the RNG-REQ message is whether the RNG-REQ message is for initial network entry or network reentry following handoff. The uplink resource allocator 26 may allocate a sufficient amount of uplink resources so that the terminal 10 can send all ranging information to be transmitted to the base station 20 based on such a condition. The controller 24 transmits the CDMA_Allocation_IE to which the determined uplink resource amount is allocated to the terminal 10 through the transceiver 22.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. For example, the present invention can be applied to an 802.16 / 802.16e OFDMA system. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, according to the present invention, when the uplink resource allocated to the terminal in the initial ranging process is insufficient to send the RNG-REQ message, the terminal should retry code ranging. In addition, since the code retrying and reassigned intervals do not guarantee sufficient resources, the UE may experience a long delay in network entry or an entry failure. The present invention solves this problem, so that the terminal can efficiently range even when the amount of resources allocated during initial ranging is small. This invention can reduce the delay that may occur when the terminal enters the network.

Claims (30)

  1. A terminal for performing a ranging procedure in association with a base station in a wireless access communication system,
    A transceiver for receiving or transmitting a message for the ranging stage;
    And a control unit for transmitting an RNG-REQ message indicating additional RNG-REQ information if there is additional RNG-REQ information to be transmitted to the base station according to the amount of resources allocated from the base station during the ranging procedure. .
  2. The terminal of claim 1, wherein the presence indication of the additional RNG-REQ information is for the terminal to request a bandwidth for additionally transmitting information according to a ranging procedure to the base station.
  3. The terminal of claim 1, wherein the control unit is allocated a basic CID through an RNG-RSP message from a base station and an uplink resource is allocated through a basic CID.
  4. The terminal of claim 3, wherein the controller additionally transmits an RNG-REQ message through the Basic CID.
  5. The terminal as claimed in claim 1, wherein the controller indicates a presence of additional RNG-REQ information in the RNG-REQ message by including a piggyback request for a bandwidth allocation request in the RNG-REQ message.
  6. The RNG-REQ message of claim 1, wherein the controller includes a Type-Length-Value (TLV) field for a bandwidth allocation request in the RNG-REQ message to indicate the presence of additional RNG-REQ information in the RNG-REQ message. Terminal.
  7. A base station for performing a ranging procedure in association with a terminal in a wireless access communication system,
    A transceiver for receiving or transmitting a message for the ranging stage;
    A control unit for allocating a basic CID to the terminal upon receiving the RNG-REQ message from the terminal and determining whether the piggyback request is included in the RNG-REQ message;
    An uplink resource for allocating an uplink resource through a basic CID when a minimum amount of uplink resource is allocated to a terminal that successfully completes code ranging through CDMA_Allocation_IE and the presence of additional RNG-REQ information is indicated in the RNG-REQ message. A base station comprising an allocation unit.
  8. The base station according to claim 7, wherein the presence indication of the additional RNG-REQ information is for the terminal to request a bandwidth for additionally transmitting information according to a ranging procedure to the base station.
  9. The base station of claim 7, wherein the controller determines whether a piggyback request for bandwidth allocation request is included in the RNG-REQ message.
  10. The base station as claimed in claim 7, wherein the controller determines whether the RNG-REQ message includes a type-length-value (TLV) value for a bandwidth allocation request.
  11. A method for performing a ranging procedure in association with a base station in a terminal of a wireless access communication system,
    Generating an RNG-REQ message indicating the additional RNG-REQ information to be transmitted when the RNG-REQ message is transmitted to the base station according to the amount of resources allocated from the base station in the ranging procedure;
    Transmitting the RNG-REQ message.
  12. 12. The method of claim 11, wherein the presence indication of the additional RNG-REQ information is for a terminal to request a bandwidth for additionally transmitting information according to a ranging procedure to a base station.
  13. 12. The method of claim 11, further comprising: receiving a basic CID from the base station through an RNG-RSP message and allocating an uplink resource through the basic CID.
  14. 14. The method of claim 13, further comprising transmitting an RNG-REQ message via the Basic CID.
  15. 12. The method of claim 11, further comprising including a piggyback request for a bandwidth allocation request in the RNG-REQ message.
  16. 12. The method of claim 11, further comprising including a Type-Length-Value (TLV) field for a bandwidth allocation request in the payload of the RNG-REQ message in the RNG-REQ message.
  17. A method for performing a ranging procedure in association with a terminal in a base station of a wireless access communication system,
    Allocating a basic CID to the terminal upon receiving the RNG-REQ message from the terminal;
    Determining whether the presence of additional RNG-REQ information is indicated in the RNG-REQ message;
    And if the RNG-REQ message includes an indication of the presence of additional RNG-REQ information, allocating an uplink resource through a basic CID.
  18. 18. The method of claim 17, further comprising: allocating a minimum amount of uplink resources through CDMA_Allocation_IE to a terminal that successfully completes code ranging.
  19. 18. The method of claim 17, further comprising determining whether a piggyback request for a bandwidth allocation request is included in the RNG-REQ message.
  20. 18. The method of claim 17, further comprising determining whether the RNG-REQ message includes a Type-Length-Value (TLV) value for a bandwidth allocation request.
  21. In the radio access communication system for performing a ranging procedure,
    When transmitting the RNG-REQ message to the base station according to the amount of resources allocated from the base station during the ranging procedure, the terminal for transmitting the RNG-REQ message indicating the additional RNG-REQ information to be transmitted;
    And a base station for allocating a basic CID to the terminal and allocating an uplink resource through the basic CID when receiving the RNG-REQ message indicating the presence of the additional RNG-REQ information from the terminal. .
  22. The wireless access communication system of claim 21, wherein the terminal is allocated a basic CID through an RNG-RSP message from the base station and an uplink resource is allocated through a basic CID.
  23. The wireless access communication system of claim 22, wherein the terminal further transmits an RNG-REQ message through the basic CID.
  24. The radio access communication system according to claim 21, wherein the terminal indicates the presence of additional RNG-REQ information in the RNG-REQ message by including a piggyback request for a bandwidth allocation request in the RNG-REQ message.
  25. 22. The method of claim 21, wherein the terminal indicates the presence of additional RNG-REQ information in the RNG-REQ message by including a TLV (Type-Length-Value) field for the bandwidth allocation request in the RNG-REQ message. Wireless access communication system.
  26. A base station for performing a ranging procedure in association with a terminal in a wireless access communication system,
    A transceiver for receiving or transmitting a message for the ranging stage;
    And an uplink resource allocator configured to determine an uplink resource amount and to allocate an uplink resource according to a condition of how much uplink resource is allocated to the terminal.
  27. 27. The base station of claim 26, wherein the condition is whether the corresponding RNG-REQ message is for initial network entry or network reentry following hard handoff.
  28. 27. The base station of claim 26, further comprising a control unit for transmitting to the terminal a CDMA_Allocation_IE to which the determined uplink resource amount is allocated.
  29. A method for performing a ranging procedure in association with a terminal in a base station of a wireless access communication system,
    Determining an uplink resource amount and allocating an uplink resource according to a condition of how much uplink resource is allocated to the terminal when receiving an RNG-REQ message from the terminal;
    And transmitting to the terminal a CDMA_Allocation_IE to which the determined uplink resource amount is allocated.
  30. 30. The method of claim 29, wherein the condition is whether the corresponding RNG-REQ message is for initial network entry or for network reentry following hard handoff.
KR1020050019854A 2005-03-09 2005-03-09 Wireless access communication system for performing ranging stage and subscriber station and base station therefor and method therein KR20060097496A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100836029B1 (en) 2006-12-08 2008-06-09 삼성전자주식회사 Method for initial ranging and access terminal and repeater in communication system
KR100968635B1 (en) * 2008-06-18 2010-07-06 주식회사 포스코아이씨티 Apparatus and method for checking the terminal connection in wireless telecommunication system
KR20100115031A (en) * 2009-04-17 2010-10-27 삼성전자주식회사 Apparatus and method for sending/receiving automatic repeat request feedback message in wireless communication system
KR101009788B1 (en) * 2005-03-09 2011-01-19 삼성전자주식회사 System and methdo for performing a ranging in a communication system
KR20110047507A (en) * 2009-10-30 2011-05-09 삼성전자주식회사 Apparatus and method for requesting uplink resourece for transmission of rng-req in a communication system
US8126034B2 (en) 2006-12-04 2012-02-28 Samsung Electronics Co., Ltd. Method for ranging with access point and repeater in wireless communication system
KR101296865B1 (en) * 2006-12-26 2013-09-16 삼성전자주식회사 Apparatus and method for allocating resource in wireless communication system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101009788B1 (en) * 2005-03-09 2011-01-19 삼성전자주식회사 System and methdo for performing a ranging in a communication system
US8126034B2 (en) 2006-12-04 2012-02-28 Samsung Electronics Co., Ltd. Method for ranging with access point and repeater in wireless communication system
KR100836029B1 (en) 2006-12-08 2008-06-09 삼성전자주식회사 Method for initial ranging and access terminal and repeater in communication system
KR101296865B1 (en) * 2006-12-26 2013-09-16 삼성전자주식회사 Apparatus and method for allocating resource in wireless communication system
KR100968635B1 (en) * 2008-06-18 2010-07-06 주식회사 포스코아이씨티 Apparatus and method for checking the terminal connection in wireless telecommunication system
KR20100115031A (en) * 2009-04-17 2010-10-27 삼성전자주식회사 Apparatus and method for sending/receiving automatic repeat request feedback message in wireless communication system
KR20110047507A (en) * 2009-10-30 2011-05-09 삼성전자주식회사 Apparatus and method for requesting uplink resourece for transmission of rng-req in a communication system

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