WO2008083580A1 - Procédé et dispositif de transfert de messages système - Google Patents

Procédé et dispositif de transfert de messages système Download PDF

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Publication number
WO2008083580A1
WO2008083580A1 PCT/CN2007/071311 CN2007071311W WO2008083580A1 WO 2008083580 A1 WO2008083580 A1 WO 2008083580A1 CN 2007071311 W CN2007071311 W CN 2007071311W WO 2008083580 A1 WO2008083580 A1 WO 2008083580A1
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WIPO (PCT)
Prior art keywords
system message
user equipment
base station
information
specific
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Application number
PCT/CN2007/071311
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English (en)
Chinese (zh)
Inventor
Hailin Jiang
Haizhou Bi
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Da Tang Mobile Communications Equipment Co., Ltd
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Filing date
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Application filed by Da Tang Mobile Communications Equipment Co., Ltd filed Critical Da Tang Mobile Communications Equipment Co., Ltd
Publication of WO2008083580A1 publication Critical patent/WO2008083580A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to messaging techniques in mobile communication systems, and more particularly to a system message delivery method and apparatus for implementing the same. Background technique
  • LTE Long Term Evolution
  • BCH broadcast channel
  • variable part of the system message size is fixed, and is transmitted at a specified time-frequency resource position by using a fixed modulation and coding scheme;
  • the variable part of the system message is mapped to the downlink shared physical resource, and the wireless resource sharing can be performed with other channels.
  • the currently proposed method has an On Demand mechanism, that is, in some cases, the user equipment (UE) initiates a request to the base station through a random access channel (RAC), and requests to send a certain request. After receiving the request, the base station broadcasts the system message requested by the UE. From the perspective of network implementation, the mechanism is: Some system messages do not need to be sent all the time, and the UE's RACH channel controls the sending or stopping of these system messages.
  • variable part system message can control the opening and closing of the system message transmission by the UE sending the random access channel request signal
  • the transmission of the system message is still for all UEs in the cell, not for the initiation request.
  • Those UEs therefore, from the perspective of cell coverage, can only use a more conservative way to send the requested system message, that is, to enable all UEs in the cell coverage to receive the transmitted system message.
  • Way, this way maybe Select a lower transmission level, a common coding method, a larger transmission power, etc., which not only causes a waste of system resources, but also affects the transmission effect. Summary of the invention
  • the main object of the present invention is to provide a system message transmission method and a device for realizing the link adaptation of system message transmission and saving system resources.
  • the present invention provides a system message transmission method, including:
  • the user equipment requests the base station to send a system message by sending a specific preamble sequence
  • the user equipment receives the scheduling information of the requested system message sent by the base station, and receives the system message required by the base station according to the received system message scheduling information, and the scheduling information is determined by the base station according to the received preamble sequence.
  • the preamble sequence carries the channel quality indication information.
  • the preamble sequence implicitly carries the channel quality indication information by setting a correspondence relationship with the channel quality indication information.
  • the system message scheduling information includes at least a transmission location of the system message and channel quality indication information.
  • the method further includes: establishing a correspondence between the preamble sequence and the system message block and the channel quality indication information; and determining the system message according to the preamble sequence
  • the scheduling information is: The base station determines, according to the received preamble sequence, a system message block that the user equipment needs to send and its transmission location and channel quality indication information.
  • the channel quality indication information includes but is not limited to: downlink transmit power, downlink signal to noise ratio, and downlink arrival signal angle.
  • the method further includes: the base station transmitting the system message requested by the user equipment in a link adaptation manner; if the channel quality indication information carries the downlink transmission power, the base station sends the system message requested by the user equipment according to the transmission power indicated by the channel quality indication information. If the channel quality indication information carries the downlink signal to noise ratio, the base station sends the system message requested by the user equipment according to the modulation and coding scheme corresponding to the signal to noise ratio indicated by the channel quality indication information; if the channel quality indication information carries the downlink signal arrival direction angle, Base station dedicated beam The system message sent by the user equipment is sent in a form.
  • the specific method for the base station to send the determined scheduling information to the user equipment is: the base station transmits the system message requesting location and transmission format requested by the user equipment through the corresponding indication field of the static partial system message main message block. Notifying the user equipment that sends the request; or, the base station notifies the user equipment that sends the request by the specific paging indication packet and its indication domain, the transmission location and transmission format of the system message requested by the user equipment; or, the base station passes the specific user equipment.
  • the indication or the indication field of the specific user equipment identifier and its scheduling control channel informs the transmission location and transmission format of the system message requested by the user equipment that sent the request.
  • the present invention further provides a user equipment, comprising at least a messaging unit, the device further comprising a system message requesting unit and an information storage unit, wherein the system message requesting unit is configured to set a specific preamble sequence and a system message block and a channel quality indicator a mapping relationship between the information, and storing the specific preamble sequence and the set mapping relationship in the information storage unit; selecting a specific preamble sequence to initiate a system message request, notifying the messaging unit of the user equipment to send a specific preamble sequence to the base station, and After receiving the system message scheduling information demodulated by the transceiver unit, instructing the message sending and receiving unit to receive the required system message according to the indicated transmission format to the transmission location indicated by the scheduling information; the messaging unit of the user equipment is further configured to send to the base station
  • the specific preamble sequence receives the system message scheduling information sent by the base station, and sends the demodulated system message scheduling information to the system message requesting unit, and receives the required system message according to the indicated transmission location according
  • the information storage unit is further configured to store a mapping relationship between the system message block and the channel quality indication information, and/or to store a mapping relationship between the specific paging indication group and the system message block and the channel quality indication information, and / or store a mapping relationship between a specific user equipment identity and system message block and channel quality indication information.
  • the present invention further provides a base station, comprising at least a messaging unit, the base station further comprising a scheduling information determining unit and an information storage unit, the scheduling information determining unit, configured to receive The preamble sequence determines scheduling information of the requested system message, and according to the determined notification manner, the messaging unit that instructs the base station sends the determined system message scheduling information to the user equipment according to the determined notification manner;
  • the information storage unit is configured to: Storing a mapping relationship between the system message block and the channel quality indicator information, and/or storing a mapping relationship between the specific preamble sequence and the system message block and channel quality indicator information, and/or storing the specific paging indicator group and the system message block And a mapping relationship between the channel quality indication information, and/or a mapping relationship between the specific user equipment identifier and the system message block and the channel quality indication information.
  • the messaging unit of the base station is further configured to: receive a preamble sequence, and place the determined system message scheduling information in a corresponding indication field of the main message block according to the determined notification manner, or by using a specific paging indication group, or a specific user equipment identifier or The specific user equipment identity and its indication domain are sent to the user equipment.
  • the UE initiates a system message sending request by sending a specific preamble sequence
  • the base station determines scheduling information of the requested system message according to the received preamble sequence, and notifies the determined scheduling information.
  • the UE that initiates the request to ensure that the transmitted system message can be received by those UEs that initiate the request, and not necessarily broadcast in the entire cell, so that the parameters such as the transmit power and the modulation and coding scheme can be performed when the system message is sent.
  • the best-performing transmission parameter that the UE can receive is guaranteed to be initiated, so as to implement link adaptation of system message transmission.
  • the transmission is selected by selecting the appropriate transmission power
  • the appropriate modulation and coding scheme is selected to complete the modulation and coding, etc., and it is no longer necessary to increase the transmission power for the UE covering the whole cell, so that the system resources can be greatly reduced while ensuring the transmission effect. Occupy, save system resources.
  • FIG. 1 is a schematic diagram of an implementation process of system message sending according to the present invention. detailed description
  • the basic idea of the present invention is: the UE requests the base station to send a system message by sending a specific preamble sequence, the base station determines scheduling information of the requested system message according to the received preamble sequence, and notifies the determined scheduling information to the UE that initiated the request, and initiates The requesting UE then receives the system message required by itself according to the received system message scheduling information to the indicated transmission location.
  • the specific preamble sequence is some preamble sequence reserved by the system for the UE to request system messages.
  • the system message requested by the UE is a variable part system message.
  • the static part of the system message is always broadcasted in a fixed transmission format at a fixed location, for example: ⁇ Transmission using four-phase frequency shift keying (QPSK) + 1/3 encoded transmission format .
  • the variable part of the system message can be divided into multiple groups, each group is called a system message block (SIB), for example:
  • SIB system message block
  • the system messages of all variable parts are divided into n groups, which are respectively represented as SIB1, ..., SIBn.
  • the general grouping is divided according to the characteristics of the system message, for example: According to the completion function, that is, the characteristics of each group of system messages are similar, which is convenient for independent switching control and transmission of each group of messages.
  • the system message sending method of the present invention includes the following steps:
  • Step 11 The UE initiates a request on the uplink channel by transmitting a specific preamble sequence, and requests the base station to send a system message.
  • the uplink channel for initiating the request may be a random access channel or an uncompetitive uplink control channel.
  • the so-called non-competition refers to the reservation of channel resources in the uplink control channel.
  • the UE sends a request in the form of a preamble sequence
  • the system reserves some preamble sequences for the UE requesting system message.
  • the reserved specific preamble sequence notifies the UE and the base station in advance.
  • Each specific preamble sequence can carry a small amount of CQI information according to the amount of information that can be carried by itself; or, the correspondence between each specific preamble sequence and channel quality indicator (CQI) information is established, which is equivalent to the preamble sequence implicitly carrying CQI information. .
  • CQI channel quality indicator
  • CQI information Including but not limited to the following parameters: downlink transmit power, used for system signal transmission power adjustment; downlink signal to noise ratio, used for adjustment of modulation coding scheme when system message is sent; downlink arrival signal angle (DOA), for system message Beam shaping adjustment is performed when transmitting.
  • the CQI information may be any one of the above parameters, or a combination of any two or three of the above parameters, and the CQI information represents a transmission format of the system message.
  • the base station may send the system message requested by the UE in a corresponding link adaptation manner according to the preamble sequence sent by the UE and its corresponding CQI information. For example, if the parameter carried by the CQI information is the downlink transmit power, the base station sends the system message requested by the UE according to the transmit power indicated by the CQI information; if the parameter carried by the CQI information is the downlink signal to noise ratio, the base station indicates the letter according to the CQI information. The modulation and coding scheme corresponding to the noise ratio transmits the system message requested by the UE. If the parameter carried by the CQI information is the direction of arrival of the downlink signal, the base station may send the system message requested by the UE in a beamforming manner.
  • each reserved preamble sequence has a certain mapping relationship with the SIB and CQI information.
  • the preamble sequence pi corresponds to the system message block SIB2 and the downlink transmit power Pa. Then, when the base station detects the preamble sequence pi, it is considered that the UE needs to transmit the system message block SIB2, and the transmit power of the downlink channel is Pa.
  • the transmitted preamble sequence is also the same; if different UEs request to send the same SIB, but the CQI information of the downlink channel is different, the most conservative CQI information is selected, for example, If there are multiple different transmit powers, the lowest transmit power is selected for transmission. Since the same UE may request multiple SIBs, a preamble sequence may also correspond to a combination of multiple SIB and CQI information.
  • Step 12 After detecting the preamble sequence sent by the UE and confirming the sequence as the specific preamble sequence, the base station determines the scheduling information of the system message required by the UE according to the preamble sequence, that is, determining the SIB that the UE needs to transmit, and the CQI of the transmission location and the downlink channel. information.
  • the base station replies to the preamble after receiving the preamble sequence sent by the UE.
  • the sequence response signal in the present invention, the base station does not reply any response signal to the preamble sequence sent by the UE.
  • Step 13 The base station notifies the UE that sends the request to the scheduling information of the system message requested by the UE, where the scheduling information of the system message refers to the transmission location and transmission format of the system message.
  • the base station may notify the UE that sends the request of the scheduling information of the requested system message by one of the following three methods:
  • the base station notifies the UE that sends the request to the transmission location and transmission format of the system message requested by the UE through the corresponding indication field of the static partial system message primary message block (MIB).
  • MIB static partial system message primary message block
  • the present invention adds a new indicator field in the MIB of the static part system message, and carries information indicating which SIBs are to be transmitted at which time-frequency resource positions are transmitted. And the transmission format of the SIB.
  • the transmission format of the SIB Of course, if there are unused domains in the MIB, you can also directly use the unused fields already in the MIB.
  • each UE that sends the request can obtain the transmission location and transmission format information from the corresponding indication domain of the MIB, and then receive the system message required by itself at the designated location.
  • the transmission format refers to link adaptation parameters, such as: modulation coding scheme, beamforming parameters, transmission power, etc., that is, CQI information.
  • the SIB domain, the SIB transmission location field, and the transport format field are added to the MIB.
  • the base station puts the SIB2 into the SIB domain when transmitting the MIB, and places the time-frequency resource location of the transmitted SIB2 into the SIB.
  • the transmission location field it is sufficient to put the CQI information corresponding to SIB2 into the transport format field.
  • the CQI information corresponding to the SIB2 is obtained according to the correspondence between the preset SIB and the CQI information.
  • the base station notifies the transmitting requesting UE of the transmission location and transmission format of the system message requested by the UE through the specific paging indication packet.
  • some reservations may be selected in advance from the paging indication packet existing in the system as a specific paging indication packet, and a one-to-one correspondence is established between the specific paging indication packet and the SIB and CQI information.
  • the established mapping relationship base station will notify all UEs in advance. Then, UE By demodulating the paging indication packet, the SIB and CQI information of the transmission system message corresponding to the paging indication packet can be obtained.
  • the CQI information represents a transmission format, and the time-frequency resource location for transmitting each SIB is given in a resource indication field corresponding to the paging indication.
  • the scheduling information of the system message is sent by the base station on the L1/L2 scheduling control channel carrying the paging indication, and at the same time, the SIB transmission period is specifically set for the sending system message, and the SIB transmission period is different from that of the UE. Call the indication period.
  • the UE monitors the L1/L2 scheduling control channel during the SIB transmission period to obtain scheduling information of the system message.
  • the base station notifies the transmission location and transmission format of the system message requested by the UE that sends the request by using the specific UE ID or the indication field of the specific UE ID and its scheduling control channel.
  • some specific UE IDs may be reserved for distinguishing between a scheduling control channel that transmits system information and a normal scheduling control channel.
  • a mapping relationship between the specific UE ID and the SIB and the CQI information is established, and the established mapping relationship base station notifies all UEs in advance, or sets a domain for indicating the SIB in the scheduling control channel.
  • the domain set in the scheduling control channel may be newly added, or may be a domain that is not used in the normal scheduling control channel.
  • the UE demodulates the specific UE ID, and the SIB corresponding thereto can be obtained. Since the scheduling control channel generally includes the resource indication field and the transmission format field, the transmission position of the SIB is given by the resource indication field of the scheduling control channel;
  • the transport format field in the downlink scheduling control channel can transmit the transmission format of the system message.
  • Step 14 After receiving the scheduling information of the system message, the UE that initiates the request, to the scheduling information At the indicated transmission location, it receives the system message required by itself according to the given transmission format.
  • the system message can be sent directly in the paging channel.
  • the scheduling information of how the UE receives the system message is related to the notification mode selected by the base station in step 13.
  • the base station selects only one of the three types, and notifies the UE in advance of how to notify. If the first type is selected, the UE reads the scheduling information of the system message from the MIB corresponding indication field of the received static partial system message; if the second type is selected, the UE performs the L1/L2 scheduling control after transmitting the preamble sequence.
  • the UE monitors the UE ID on the scheduling control channel after transmitting the preamble sequence, and determines whether the received UE ID is a specific UE ID. If yes, the SIB is obtained according to the specific UE ID, and The scheduling information of the system message, that is, the transmission location and the transmission format, is obtained by demodulating the scheduling control channel.
  • link adaptive transmission can be performed when the system message is transmitted.
  • the manner of the link adaptation may include: adaptively adjusting the transmit power of the system message, adaptively adjusting the modulation and coding mode of the system message transmission, and transmitting the system message to perform downlink beamforming, etc., and the system message transmission format or The mode should be included in the scheduling information of the system message.
  • the present invention adds a system message requesting unit and an information storage unit to the user equipment, where the system message requesting unit is configured to set a mapping relationship between a specific preamble sequence and SIB and CQI information, and set a specific preamble sequence. And storing the SIB and the CQI information in the information storage unit together with the corresponding information; the system message requesting unit is further configured to initiate a system message request, select a specific preamble sequence, and notify the user equipment that the existing messaging unit sends the special message to the base station. Determining the preamble sequence, and after receiving the system message scheduling information demodulated by the messaging unit, instructing the messaging unit to receive the required system message according to the indicated transmission format to the transmission location indicated by the scheduling information.
  • the information storage unit is further configured to store a mapping relationship between SIB and CQI information, and/or store a mapping relationship between a specific paging indication group and SIB and CQI information, and/or store a specific UE ID and SIB and CQI The mapping relationship between information.
  • the messaging unit of the user equipment is further configured to send a specific preamble sequence to the base station, receive system message scheduling information sent by the base station, and send the demodulated system message scheduling information to the system message requesting unit, according to the indicated transmission location, according to the indication.
  • the transport format receives the required system messages.
  • the base station needs to add a scheduling information determining unit and an information storage unit, where the scheduling information determining unit is configured to determine scheduling information of the requested system message according to the received preamble sequence, where the received preamble sequence is from the base station.
  • the messaging unit sends the determined system message scheduling information to the user equipment according to the determined notification manner according to the determined notification manner.
  • the information storage unit is configured to store a mapping relationship between SIB and CQI information, and/or store a mapping relationship between a specific preamble sequence and SIB and CQI information, and store a specific paging indication group and the SIB and CQI information. Mapping relationship, and/or storing a mapping relationship between a specific UE ID and SIB and CQI information.
  • the messaging unit of the base station is further configured to: receive a preamble sequence, and place the determined system message scheduling information in a corresponding indication field of the MIB according to the determined notification manner, or by a specific paging indication group, or a specific UE ID, or a specific UE ID. And its indication domain is sent to the user equipment.

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

Abstract

Procédé de transfert de messages système selon lequel un équipement utilisateur demande à une station de base de transmettre un message système au moyen d'informations de pré-séquence spécifiées, reçoit de la station de base des informations de programmation dudit message, et reçoit le message système requis depuis la position de transmission indiquée conformément aux informations de programmation reçues. Sont également décrits un équipement utilisateur et une station de base. Cette invention permet de réaliser une 'auto-adaptation de la liaison pour la transmission du message système et d'économiser les ressources du système.
PCT/CN2007/071311 2007-01-05 2007-12-21 Procédé et dispositif de transfert de messages système WO2008083580A1 (fr)

Applications Claiming Priority (2)

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CN200710063262.2 2007-01-05
CN2007100632622A CN101217689B (zh) 2007-01-05 2007-01-05 一种系统消息传送方法及其实现装置

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WO2008083580A1 true WO2008083580A1 (fr) 2008-07-17

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