KR100826555B1 - Method for transmitting message of communication system supporting ofdm/ofdma - Google Patents

Abstract

A message transmission method for a communication system supporting OFDM/OFDMA methods is provided to know the capability of each terminal in an initial network entrance stage, thereby efficiently using scheduling and radio resources. A message transmission method for a communication system supporting OFDM/OFDMA(Orthogonal Frequency Division Multiplexing/Orthogonal Frequency Division Multiplexing Access) methods comprises the following steps of: transmitting a UCD(Uplink Channel Descriptor) message including ranging code information which indicates the support of basic terminal capability from a BS(Base Station)(S701); and transmitting uplink/downlink messages to a terminal through one of PUSC(Partial Usage of SubChannels), FUSC(Full Usage of SubChannels), or band AMC(Adaptive Modulation and Coding) regions on the basis of the ranging code information(S704~S720).

Description

Method for transmitting message of communication system supporting OFDM / OFDMA

1 is a block diagram illustrating a procedure for entering a network in a wireless communication system

2 is a diagram illustrating a management message flow in a network entry process;

3 is a block diagram showing the flow of messages during the periodic ranging procedure

4 is a block diagram illustrating a message flow when a bandwidth request ranging procedure is performed;

5 is a table illustrating a configuration of a ranging code used for performing ranging in FIGS. 2, 3, and 4

6 is a table showing a ranging code configuration in a wireless communication system according to the present invention.

7 is a block diagram illustrating a management message flow during a network entry process in a wireless communication system according to the present invention.

8 is a block diagram showing the flow of messages during the periodic ranging procedure in a wireless communication system according to the present invention

9 is a block diagram showing the flow of messages during the bandwidth ranging procedure in the wireless communication system according to the present invention

10 is a table illustrating an AAS initial ranging CID structure.

11 is a diagram illustrating a message flow configuration using an AAS initial ranging CID during a network entry process.

The present invention relates to a wireless communication system, and specifically, OFDM / OFDMA for knowing the capability of each terminal in the initial stage of network entry by dividing ranging codes into code groups to include information of each terminal. The present invention relates to a message transmission method for a communication system supporting the scheme.

Currently, research is being actively conducted to support high-speed services in a form of guaranteeing mobility and quality of service (QoS) in a broadband wireless access (BWA) communication system. The system is an Institute of Electrical and Electronics Engineers (IEEE) 802.16d communication system and an IEEE802.16e communication system.

The IEEE 802.16d communication system and the IEEE 802.16e communication system are orthogonal frequency division multiplexing (OFDM) / orthogonal frequency division to support a broadband transmission network on a physical channel of a wireless MAN system. A communication system employing an Orthogonal Frequency Division Multiplexing Access (OFDMA) scheme.

Hereinafter, ranging control and message flow of a terminal in a wireless communication system will be described with reference to the accompanying drawings.

The following description is based on the Institute of Electrical and Electronics Engineers (IEEE) 802.16e-2005 standard.

1 is a block diagram illustrating a procedure for entering a network in a wireless communication system.

The communication system considered in IEEE (Institute of Electrical and Electronics Engineers) 802.16-2005 is a system considering the mobility of the terminal.

In the wireless communication system, the network entry process includes a downlink channel scan process (S101), an uplink parameters process (S102), ranging and automatic adaptation (Ranging & < RTI ID = 0.0 >) < / RTI > Automatic Adjustments (S103), Negotiate Basic Capabilities (S104), SS Authorization and Key Exchange (S105), and Register with BS (S105) S106), IP connectivity and operation parameters (IP Connectivity & Operational Paramaters) process (S107).

As shown in FIG. 1, first, a downlink channel is scanned for channel synchronization. The process includes performing a DL-MAP message and downlink channel-related parameters indicating downlink subframe allocation and resource allocation information for each frame. By receiving a Downlink Channel Decsriptor (DCD) message.

The process of acquiring uplink parameters may include receiving a UL-MAP message indicating how resources constituting an uplink subframe are allocated to SSs and an uplink channel decksor message having parameters related to an uplink channel. Is done through.

The ranging and automatic adjustment process is performed by CDMA ranging, reception of CDMA_Allocation_IE message, ranging request and response (RNG-REQ, RNG-RSP) messages.

Ranging is classified into Initial Ranging and Handover Ranging, Bandwidth Request Ranging, and Periodic Ranging according to its purpose.

Negotiate Basic Capabilities (Negotiate Basic Capabilities) process is performed by the capability request / response message (SBC (SS Basic Capability)-REQ / RSP), the terminal of the terminal such as permutation support (Permutation Support), terminal demodulator This is the process of negotiating support capabilities.

Hereinafter, a management message flow, ranging procedure, and ranging code configuration in a network entry process will be described.

2 is a diagram illustrating a management message flow in a network entry process.

As shown in FIG. 2, the management message flow in the network entry process includes a process of transmitting a broadcast management message in a partial usage of subchannels zone (S201 to S203) and a partial usage of a PUSC region. Unicast Management Message Exchange Process in SubChannels Zone (S204 ~ S211), and Unicast Management Message (Unicast) in PUSC, FUSC (FUSC), or Adaptive Modulation and Coding (AMC) Zone Management Message) can be divided into the exchange process (S212 ~ S219).

Broadcast Management Message transmission in the Partial Usage of SubChannels Zone (PUSC) includes: SICH / DCD / UCD message (S201), DL-MAP / UL-MAP message (S202), for neighboring base stations. A base station transmission of a NBR-ADV (Neighbor Advertisement) message (S203) for obtaining information is performed.

The unicast management message exchange in the partial usage of subchannels zone includes RNG-REQ and RNG-RSP management messages (S204 to S207) and a status field to obtain accurate timing offset and power adjustment. CDMA Allocation IE message (S208), RNG-REQ (MAC_Addr) (S209) and RNG-RSP (Primary_Cid) (S210), base station (Radio) as a response to the CDMA code based on the initial ranging after RNG-RSP which is success It includes the exchange of SS Basic Capability Request (SBC-REQ) (S211) and SS Basic Capability Response (SBC-RSP) management message (S212) for capability negotiation between the Access Station (RAS) and the MS.

The Unicast Management Message exchange in PUSC, Full Usage of SubChannels (FUSC), or Adaptive Modulation and Coding (AMC) area includes a Privacy Key Management Request (PKM-REQ) message and a Privacy (PKM-RSP). Key Management Response) messages S213 to S218, a REG-REQ (Mobility_Feature) message S219, and a REG-RSP (2nd-Cid) message S220 are exchanged.

Initial ranging during the network entry process is a ranging performed by a base station to acquire synchronization with a terminal, and is performed to adjust an accurate time and frequency offset between the terminal and the base station and to adjust a transmit power. Corresponds to the ranging.

FIG. 3 shows the flow of messages during the periodic ranging procedure. Since the base station RAS only knows the CDMA code, the exchange of messages related to all the periodic ranging in FIG. 3, that is, RNG-REQ (S301) (S303). And exchange of the RNG-RSP management message (S302) (S304) is made in the PUSC area.

The periodic ranging refers to a ranging that the terminal, which has adjusted the time offset and the transmission power with the base station through the initial ranging, performs periodically with the base station to adjust the time offset and the transmission power again according to the channel state. In this case, the periodic ranging determines and performs the periodic ranging operation when there is no data to be transmitted on the uplink channel.

4 shows a message flow during a bandwidth request ranging procedure. Before receiving the BW-REQ Header message including the CID of the MS, the BS can know the capability of each MS. Since there is no bandwidth request ranging message, that is, RNG-REQ and RNG-RSP (S401 to S404), CDMA Allocation IE (S405), and BW-REQ Header message (S406) are exchanged in the PUSC region.

Here, the bandwidth request ranging is a ranging that requires a bandwidth allocation in order for the terminal, which has adjusted the time offset and the transmission power to the base station through initial ranging, to perform actual communication with the base station.

FIG. 5 is a table illustrating a configuration of a ranging code used for performing ranging shown in FIGS. 2, 3, and 4.

The overall field configuration of the ranging code table includes Initial Ranging Codes 501, Periodic Ranging Codes 502, Bandwidth Request Ranging Codes 503, Start of Ranging Codes Group 504 and Handover Ranging Codes 505.

5 shows an example of a configuration of a ranging code defined in an uplink channel discript (UCD) message in a standard (IEEE802.16e-2005).

However, in such a wireless communication system of the prior art, higher order modulation and coding configuration in a frequency selective zone such as Band AMC or AAS for performance improvement of the system in the network entry process and each ranging process of the terminal. Even when (Scheme) is required, since the UE does not know the basic capability in advance, only the messages are allocated and transmitted in the broadcast PUSC region, and thus a long PUSC region must be periodically provided.

In addition, when the base station supports AAS, beamforming may be delayed. In the current standard, when a message having a large unicast message size such as SBC_REQ is transmitted in the PUSC area. That is, since the number of symbols allocated is small and the subchannels are distributed, the density of transmission power may be reduced.

Therefore, it is necessary to enable efficient use of radio resources and AAS support as compared to the message transmission method of the conventional communication system.

Accordingly, an object of the present invention is to provide a method for transmitting a message in a wireless communication system that can efficiently use radio resources by knowing the capability of each terminal in the initial stage of network entry. .

Another object of the present invention is to provide a method for transmitting a message in a wireless communication system for efficiently using radio resources by allowing a base station to know the capability of each terminal in the ranging step of the terminal.

Another object of the present invention is a communication system supporting an OFDM / OFDMA scheme that enables efficient use of radio resources and AAS operation for a UE capable of supporting an Adaptive Modulation and Coding (AMC) band or an AAS operation in a frequency selective region. The purpose of the present invention is to provide a message transmission method.

According to an aspect of the present invention, there is provided a message transmission method for a communication system supporting an OFDM / OFDMA scheme, the method comprising: transmitting a UCD message including ranging code information indicating support of a terminal basic capability from a base station; And transmitting an uplink / downlink message to one of the PUSC, FUSC, or Band AMC region to the terminal based on the ranging code information.

A message transmission method for a communication system supporting an OFDM / OFDMA scheme according to the present invention for achieving another object includes an initial ranging CID indicating basic capability of a terminal with a specific value after initial ranging success. Transmitting a ranging request message; Receiving an uplink / downlink message transmitted through one of the PUSC, FUSC, BAND AMC region based on the ranging request message; characterized in that it comprises a.

According to another aspect of the present invention, there is provided a message transmission method for a communication system supporting an OFDM / OFDMA scheme, the method including: receiving a UCD message including ranging code information indicating basic capability support of a terminal from a base station; And performing ranging by using the ranging code information.

Here, the basic capability of the terminal is characterized in that at least one of the AAS mode and AMC support function.

And the base station is characterized in that the base station supporting the AAS operation.

Hereinafter, a preferred embodiment of a message transmission method for a communication system supporting the OFDM / OFDMA scheme according to the present invention will be described in detail.

Features and advantages of the message transmission method for a communication system supporting the OFDM / OFDMA scheme according to the present invention will be apparent from the detailed description of each embodiment below.

6 is a table showing a ranging code configuration in a wireless communication system according to the present invention.

The configuration of the ranging code according to the present invention is transmitted to the terminal through a UCD message, and the code for the terminal supporting the AAS mode and the Band AMC and the terminal not supporting the AAS mode and the Band AMC are divided into groups. It is divided into code for.

First, the entire field configuration of the ranging code table includes Initial Ranging Codes 611, Initial Ranging Codes for MS supporting AAS and AMC. 601), Periodic Ranging Codes (612), Periodic Ranging Codes for MS supporting AAS and AMC (602), bandwidth request ranging codes (Bandwidth Request Ranging Codes) 613, Bandwidth Request Ranging Codes for MS supporting AAS and AMC 603, code for starting a ranging code group Start of Ranging Codes Group (615), Handover Ranging Codes (614), Handover Ranging Codes for MS supporting AAS and AMC 604.

The ranging codes of the above fields indicate the number of codes, the possible values are 0 to 255, and each tag is designated differently.

Initial Ranging Codes are ranging codes for adjusting an accurate time and frequency offset between a terminal and a base station and adjusting a transmit power, and do not represent terminal basic capability information.

Initial Ranging Codes for MS supporting AAS and AMC, which supports AAS mode and AMC, adjusts the correct time and frequency offset between the terminal and the base station and adjusts transmit power. In the ranging code, UE basic capability information is indicated.

Periodic Ranging Codes S612 are ranging codes periodically performed with a base station to adjust time offset and transmission power again according to channel conditions, and do not include terminal information.

In addition, periodic ranging codes for MSs supporting AAS mode and AMC (Periodic Ranging Codes for MS supporting AAS and AMC) (S602) are periodically performed with the base station to adjust time offset and transmission power again according to channel conditions. It includes the terminal information as the ranging code.

The bandwidth request ranging codes S613 are ranging codes for requesting bandwidth allocation in order for the terminal to perform actual communication with the base station, and do not include the terminal information.

The bandwidth request ranging code for MS supporting AAS and AMC (S603) for AAS mode and AMC supports a bandwidth allocation in order for the UE to perform actual communication with the base station. It includes the terminal information as the ranging code.

Similarly, Handover Ranging Codes (S614) do not include terminal information, and Handover Ranging Codes for MS supporting AAS and AMC (supporting AAS mode and AMC) ( S604) includes terminal information.

In the case of supporting the AAS (Adaptive Antenna System) function, a signal gain can be obtained through beam formation of the antenna.

In the method for controlling network entry of a terminal in the wireless communication system according to the present invention, as shown in FIG. 6, the base station knows the performance of the terminal at the beginning of network entry by configuring a ranging code, and subsequent message exchange is performed using PUSC and FUSC It can be made in the area of SubChannels, or Adaptive Modulation and Coding (AMC) to improve the beam forming gain characteristics in the AAS mode.

The network entry control method of the terminal in the wireless communication system according to the present invention constituting the ranging code as described above will be described in detail.

7 is a diagram illustrating a management message flow in a network entry process in a wireless communication system according to the present invention.

FIG. 8 is a diagram illustrating a message flow during a periodic ranging procedure in a wireless communication system according to the present invention, and FIG. 9 is a diagram illustrating a message flow during a bandwidth ranging procedure in a wireless communication system according to the present invention. It is also.

First, a management message flow in a network entry process in a wireless communication system according to the present invention will be described.

As shown in FIG. 7, the broadcast management message exchange in the Partial Usage of SubChannels Zone (PUSC) and the UNI in the PUSC, FUSC (Full Usage of SubChannels), or Adaptive Modulation and Coding (AMC) areas. It can be divided into a Unicast Management Message exchange.

The broadcast management message exchange in the partial usage of subchannels zone includes a SICH / DCD / UCD message (S701), a DL-MAP / UL-MAP message (S702), and neighbor base stations. An exchange of NBR-ADV (Neighbor Advertisement) messages (S703) for obtaining information is performed.

In addition, the exchange of Unicast Management Messages (PUSC), Full Usage of SubChannels (FUSC), or Adaptive Modulation and Coding (AMC) domains allows RNG-REQ and RNG-RSP management to achieve accurate timing offsets and power adjustments. Messages S704 to S707 include terminal information in the RNG-REQ message, and subsequent message exchange is performed in a PUSC, Full Usage of SubChannels (FUSC), or Adaptive Modulation and Coding (AMC).

That is, since the base station knows that the terminal supports AAS mode and Band AMC by Initial Ranging Codes for MS supporting AAS and AMC as shown in FIG. 6. Message exchange is performed in the PUSC, Full Usage of SubChannels (FUSC), or Adaptive Modulation and Coding (AMC), not in the Partial Usage of SubChannels Zone.

Subsequent messages are responses to the CDMA code based on initial ranging after RNG-RSP, which is the success of the status field, as CDMA Allocation IE message (S708), RNG-REQ (MAC_Addr) (S709), and RNG-RSP (Primary_Cid). (S710), SS Basic Capability Request (SBC-REQ) (S711), SS Basic Capability Response (SBC-RSP) management message 712, PKM-REQ (SBS-REQ) for capability negotiation between the base station (BS) and the MS; This includes exchange of Privacy Key Management Request (PKM-RSP) privacy key management response (PKM-RSP) messages (S713 through S718) and REG-REQ (Mobility_Feature) messages (S719) and REG-RSP (2nd-Cid) (S720) messages. do.

The network entry procedure in the wireless communication system according to the present invention will be described in detail.

NBR for acquiring information about SICH / DCD / UCD message, DL-MAP / UL-MAP message, and neighbor base stations in the broadcast management message exchange in the Partial Usage of SubChannels Zone (PUSC) Exchange of neighbor advertisement (ADV) messages takes place.

The terminal MS transmits an initial ranging code to the base station RAS in a competitive manner through an Initial RNG-REQ (code) message. Such code ranging enables the uplink timing and power offset adjustment of the terminal to be performed.

Here, when the terminal transmitting the Initial RNG-REQ (code) message is a terminal supporting the AAS mode and AMC, the base station by the initial ranging code (Initial Ranging Codes for MS supporting AAS and AMC) including the terminal information The capability of the terminal is determined so that subsequent message exchange is performed by unicasting in PUSC, FUSC (Full Usage of SubChannels), or AMC (Adaptive Modulation and Coding).

The base station unicasts the code ranging information and the power offset adjustment value transmitted by the terminal in the Initial RNG-RSP message.

When the UE receives the Initial RNG-RSP message, it checks the code ranging information and adjusts the power offset. When the status field of the RNG-RSP message is continue, the terminal retries the code ranging.

When the base station determines that the timing and power adjustment is made through the code ranging attempted by the terminal, the base station indicates and transmits the status field of the Initial RNG-RSP message as success.

The base station allocates and applies an uplink bandwidth for transmitting an RNG-REQ message by using a UL-MAP having a CDMA_Allocation_IE.

The CDMA_Allocation_IE includes an uplink resource amount allocated to the terminal together with code ranging information transmitted by the terminal. Then, if the status field of the RNG-RSP message is success, the terminal finishes code ranging and attempts message ranging.

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 terminal transmits a capability request message (SBC (SS Basic Capability) -REQ) to perform a capability negotiation procedure through a basic CID and a primary CID included in the RNG-RSP.

And a terminal authorization and key exchange (SS Authorization and Key Exchange) process according to a specification using a PKM-REQ (Privacy Key Management Request) message and a PKM-RSP (Privacy Key Management Response) message, a BS registration process, It consists of IP Connectivity & Operational Paramaters.

8 shows a message flow during a periodic ranging procedure, in which a Periodoc RNG-REQ (code) message is transmitted from a base station RAS by a periodic ranging code for MS supporting AAS and AMC. It is determined that the terminal supports the AAS mode and the AMC, and thus, exchange of messages S801 to S804 related to all periodic ranging is performed in a PUSC, Full Usage of SubChannels (FUSC), or Adaptive Modulation and Coding (AMC) region. It can be seen that.

9 illustrates a message flow during a bandwidth request ranging procedure, in which a BS requests RAS by a bandwidth request ranging code for MS supporting AAS and AMC. A UE that transmits an RNG-REQ (code) message for a bandwidth request is determined to be a terminal that supports AAS mode and AMC, and thus bandwidth allocation and data transmission and reception after reception of a BW-REQ header message (S905 to S908). It can be seen that this is done in the PUSC, FUSC (Full Usage of SubChannels), or AMC (Adaptive Modulation and Coding).

A method of controlling network entry of a terminal, which enables a base station to know whether a corresponding terminal supports AAS using an AAS initial ranging connection identifier (CID), will now be described.

FIG. 10 is a table illustrating an AAS initial ranging CID structure, and FIG. 11 is a message flow diagram illustrating an AAS initial ranging CID during a network entry process.

By using the AAS initial ranging connection identifier (CID), the base station receives the RNG-REQ (MAC_Addr) message from the terminal so that the base station knows the capabilities of the terminal, so that subsequent message exchange is performed using PUSC, FUSC (Full Usage of SubChannels). ), Or AMC (Adaptive Modulation and Coding).

The network entry procedure of a terminal using AAS initial ranging connection identifier (CID) is as follows.

First, SICH / DCD / UCD message (S1101), DL-MAP / UL-MAP message (S1102), and adjacent base station by exchanging broadcast management messages in a PUSC zone (Partial Usage of SubChannels Zone). The exchange of the NBR-ADV (Neighbor Advertisement) message S1103 is performed to obtain information about the fields.

Until the base station receives the RNG-REQ (MAC_Addr) message including the CID having the terminal information, the unicast management message exchange is performed in the partial usage of subchannels zone (PUSC). RNG-REQ and RNG-RSP management messages for obtaining power and power coordination, including the exchange of CDMA Allocation IE messages (S1104 through S1108) as a response to the CDMA code based on initial ranging after RNG-RSP, which is the success of the status field. do.

When the base station receives the RNG-REQ (MAC_Addr) message including the CID having the terminal information, the terminal determines that the terminal supports the AAS mode, and thus, PUSC, FUSC (Full Usage of SubChannels), or AMC (Adaptive Modulation and The exchange of unicast management messages S1109 to S1120 is performed in the Coding area.

As described above, the present invention divides ranging codes into code groups to include information of each terminal, or whether a corresponding terminal supports AAS using an AAS initial ranging connection identifier (AID). After reception of the corresponding message, unicast management message exchange in the PUSC, FUSC (FUSC), or Adaptive Modulation and Coding (AMC) area is performed according to the capability of each terminal. do.

Therefore, since the support capability of the terminal is known in advance, the beamforming can be performed faster than before in the base station supporting the AAS. In addition, a message with a large message size such as SBC_REQ can be transmitted to the AAS through the band AMC area, thereby enabling transmission without degrading power density.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

The message transmission method for a communication system supporting the OFDM / OFDMA scheme has the following effects.

By knowing the capability of each terminal in the early stage of network entry, scheduling and efficient use of radio resources are possible.

In addition, the present invention has an effect of enabling the base station to know the capabilities of each terminal in the ranging step of the terminal to enable efficient use of scheduling and radio resources.

The present invention has an effect of efficiently using radio resources for a terminal capable of supporting an AAS operation or a band adaptive modulation and coding (AMC) region in a frequency selective region.

In addition, since the support capability of the UE is known in advance, the beamforming may be performed faster in the base station supporting the AAS than before.

Another effect according to the present invention is that it is possible to transmit a message with a large message size such as SBC_REQ to the AAS through the band AMC area, so that transmission can be performed without degrading power density.

Claims (13)

Transmitting from the base station a UCD message including ranging code information indicating support of a terminal basic capability; Transmitting an uplink / downlink message to one of a PUSC, FUSC or Band AMC region to a terminal based on the ranging code information; and a message transmission method for a communication system supporting an OFDM / OFDMA scheme, comprising: . The method of claim 1, wherein the basic capability of the terminal is at least one of an AAS mode and an AMC support function. The ranging code information of claim 1, wherein Initial Ranging Codes, Periodic Ranging Codes, A method for transmitting a message for a communication system supporting an OFDM / OFDMA scheme, comprising bandwidth request ranging codes and handover ranging codes. 2. The method of claim 1, further comprising the step of the terminal transmitting a ranging request message by using the ranging code information. The method of claim 1, wherein the uplink / downlink message is a response to a CDMA code based on initial ranging, a CDMA Allocation IE message, an SBC-REQ (SS Basic Capability Request) and an SBC-RSP for capability negotiation between a base station and a terminal. (SS Basic Capability Response) management message, PKM-REQ (Privacy Key Management Request) message, PKM-RSP (Privacy Key Management Response) message, REG-REQ (Mobility_Feature) message, REG-RSP (2nd-Cid) message Message transmission method for a communication system supporting an OFDM / OFDMA method, characterized in that one. The method of claim 1, wherein the base station is a base station supporting AAS operation. Transmitting a ranging request message including an initial ranging CID indicating a basic capability of the terminal with a specific value after initial ranging success; Receiving an uplink / downlink message transmitted through one of a PUSC, FUSC, and BAND AMC region based on the ranging request message; and a message for a communication system supporting an OFDM / OFDMA scheme, comprising: Transmission method. 10. The method of claim 7, wherein the basic capability of the terminal is at least one of an AAS mode and an AMC support function. 8. The method of claim 7, further comprising the step of determining, by a base station, the basic capability of the terminal according to the ranging request message. 8. The method of claim 7, wherein the base station is a base station supporting AAS operation. Receiving a UCD message including ranging code information indicating basic capability support of a terminal from a base station; And performing ranging by the terminal using the ranging code information. 11. The message transmission method of claim 1, wherein the terminal performs ranging by using the ranging code information. 12. The method of claim 11, wherein the basic capability of the terminal is at least one of an AAS mode and an AMC support function. 12. The method of claim 11, wherein the base station is a base station supporting AAS operation.

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