WO2010121437A1 - Méthode et dispositif de transmission sans fil de données dans un système de communication - Google Patents

Méthode et dispositif de transmission sans fil de données dans un système de communication Download PDF

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Publication number
WO2010121437A1
WO2010121437A1 PCT/CN2009/071461 CN2009071461W WO2010121437A1 WO 2010121437 A1 WO2010121437 A1 WO 2010121437A1 CN 2009071461 W CN2009071461 W CN 2009071461W WO 2010121437 A1 WO2010121437 A1 WO 2010121437A1
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Prior art keywords
henb
enb
common channel
channel
offset
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PCT/CN2009/071461
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English (en)
Chinese (zh)
Inventor
黄英
邱勇
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华为技术有限公司
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Priority to PCT/CN2009/071461 priority Critical patent/WO2010121437A1/fr
Priority to CN200980123750.5A priority patent/CN102077667B/zh
Publication of WO2010121437A1 publication Critical patent/WO2010121437A1/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
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a method and apparatus for wireless data transmission. Background technique
  • a small base station or a home base station in addition to the macro base station eNB deployed by the operator, there is another base station configuration: a small base station or a home base station, generally referred to as an AP (Access point), which is collectively referred to herein as an HeNB.
  • This small base station is characterized by small coverage, flexible installation, and support plug-and-play to some extent.
  • Orthogonal Frequency Division Multiplexing Orthogonal Frequency Division Multiplexing 1 J Wo is to improve communications with the parallel transfer of a mobile data communications technology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • PRB physical resource block
  • the OF system requires very accurate time-frequency synchronization, so the synchronization technique is one of the key technologies of the OFDM system.
  • the downlink synchronization process is mainly performed through a synchronization channel (Synchronization Channel, SCH).
  • SCH Synchronization Channel
  • the SCH of the read-only cell is the first step for the UE to access the cell. If the SCH is to be resident after the SCH has been read, the physical broadcast channel (PBCH) must be read correctly.
  • PBCH physical broadcast channel
  • the user equipment receives the synchronization channel (SCH) and the broadcast channel (PBCH) signal of the eNB, and also receives the SCH and PBCH signals of the HeNB, and the transmission power of the HeNB and the eNB are similar.
  • the UE uses its own storage.
  • the synchronization sequence is connected to the peak of the correlation calculation of the received radio signal, and the synchronization signal of each cell cannot be distinguished, that is, the different cells cannot be distinguished (ie, the HeNB and the eNB cannot be distinguished), and the eNB is for the HeNB. It is an interference, so the UE cannot correctly decode the PBCH.
  • Embodiments of the present invention provide a method and apparatus for wireless data transmission in a communication system to solve the problem of wireless data transmission interference.
  • an embodiment of the present invention provides a method for wireless data transmission in a communication system, where the communication system includes at least one home base station HeNB and at least one macro base station e NB, the method includes: in a time domain and/or The common channel of the HeNB and the eNB is shifted in the frequency domain, and wireless data transmission is performed on the staggered common channel.
  • Embodiments of the present invention can prevent data transmitted on the common channel of the two from interfering with each other by staggering the common channel of the HeNB and the eNB in the time domain and/or the frequency domain.
  • the embodiment of the present invention further provides a wireless data receiving method, the method comprising: searching a common channel of an eNB; searching for a channel of a HeNB that is offset from a common channel of the eNB in a frequency domain and/or a time domain; And receiving wireless data transmitted on a common channel of the eNB and the HeNB.
  • the embodiment of the present invention can correctly receive the data transmitted on the common channel of the HeNB and the eNB by searching the common channel of the eNB and searching for the common channel of the HeNB that is staggered with the common channel of the eNB in the time domain and/or the frequency domain, so that the data transmitted on the common channel of the HeNB and the eNB can be correctly received, thereby Correctly distinguish each cell to avoid receiving errors.
  • the embodiment of the present invention further provides a communication system, where the communication system includes at least one home base station HeNB and at least one macro base station eNB, where the common channel of the HeNB and the eNB is shifted in a frequency domain and/or a time domain, The HeNB and the eNB are configured to perform data transmission on the staggered common channel.
  • the communication system provided by the embodiment of the present invention can prevent the data transmitted on the common channel of the two from interfering with each other by staggering the common channel of the HeNB and the eNB in the time domain and/or the frequency domain.
  • An embodiment of the present invention further provides a user equipment UE, where the UE includes: a search unit, configured to search a common channel of a macro base station eNB, and used to share a common channel with an eNB in a frequency domain and/or a time domain. a common channel of the staggered HeNB performs a search; and a receiving unit is configured to receive the wireless data transmitted on the common channel.
  • a search unit configured to search a common channel of a macro base station eNB, and used to share a common channel with an eNB in a frequency domain and/or a time domain.
  • a common channel of the staggered HeNB performs a search; and a receiving unit is configured to receive the wireless data transmitted on the common channel.
  • the UE provided by the embodiment of the present invention can correctly receive the HeNB by searching the common channel of the eNB and searching for the common channel of the HeNB that is staggered with the common channel of the eNB in the time domain and/or the frequency domain.
  • the data transmitted on the common channel of the eNB can correctly distinguish each cell and avoid receiving errors.
  • FIG. 1 is a flow chart of a method for wireless data transmission in a communication system according to the present invention
  • FIG. 2 is a flow chart showing an embodiment of a wireless data receiving method according to the present invention
  • FIG. 3 is a flowchart of still another embodiment of a wireless data transmission method in a communication system according to the present invention
  • FIG. 4 is a flowchart of another embodiment of a wireless data transmission method in a communication system according to the present invention.
  • 6a is a time domain diagram of a SCH channel of an eNB according to an embodiment of the present invention.
  • 6b is a time domain diagram of a SCH channel of a HeNB according to an embodiment of the present invention.
  • FIG. 7a is a time domain diagram of a PBCH channel of an eNB according to an embodiment of the present invention.
  • FIG. 7b is a time domain diagram of a PBCH channel of a HeNB according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a UE according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a UE according to another embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a method and apparatus for wireless data transmission in a communication system. The invention will be described in detail below with reference to the accompanying drawings.
  • FIG. 1 is a flow chart showing an embodiment of a method for wireless data transmission in a communication system according to the present invention.
  • the communication system includes at least one home base station HeNB and at least one macro base station eNB.
  • Step 101 The common channel of the HeNB and the eNB is staggered in the frequency domain and/or the time domain.
  • Step 102 Perform data transmission on the staggered common channel.
  • shifting the frequency band of the common channel of the eNB and the HeNB in the frequency domain further includes: setting a cell center frequency point of the HeNB, such that the center frequency point of the HeNB cell has a frequency band offset from a center frequency point of the eNB cell
  • the shift amount is set according to the frequency band offset, so that the common channel of the HeNB and the eNB are phase-shifted in the frequency domain, and the frequency band offset may be fixed by the system or dynamically allocated by the system to the HeNB.
  • the phase shift of the common channel in the frequency domain refers to the offset from the center frequency of the cell band.
  • the cell frequency band is 2020-2040M.
  • all common channels occupy 1.25M of the center frequency, that is, 2029. 375-2030. 625M.
  • the offset is 3 (or -3) M
  • the common channel occupancy range is 2026. 375-3027. 625M.
  • the eNB, the HeNB, the UE, the network management, and the like in the system can know the offset of the system according to the system specification.
  • the HeNB performs data transmission of the common channel according to the offset amount, and the UE searches according to the offset.
  • the foregoing system dynamically allocates an offset to the HeNB, which means that the offset can be changed.
  • the eNB and the HeNB obtain an offset through X2/S1 interface information interaction, or send an offset to the HeNB by the network management or the self-organizing server.
  • the amount, or the operator, when purchasing the HeNB sets the offset by manual input, and the HeNB informs the eNB of the offset.
  • the terminal can transmit the offset to the UE by the eNB by interacting with the information of the eNB.
  • the eNB may pass a Radio Resource Control Protocol (RRC) message (eg, an RRC reconfiguration message or a paging message, or may be a newly added RRC message), a system broadcast message, a transit non-access stratum message, a paging message, or The frame or symbol or time slot of the physical layer transmits the associated frequency band offset to the user terminal UE.
  • RRC Radio Resource Control Protocol
  • the HeNB offsets its own common channel according to the offset, and the UE searches according to the offset.
  • the HeNB e NB and the common channel is shifted in the time domain symbols, comprising: a frame structure of the HeNB common channel frame structure of the eNB is not the same common channel.
  • the method may be: reading, by the HeNB, the eNB's SCH channel, synchronizing with the eNB, or ensuring the time synchronization relationship between the HeNB and the eNB through a synchronization network, such as the 1588 protocol, or by using GPS.
  • the common channel includes at least one of a following channel synchronization channel (SCH), a broadcast channel (PBCH), a control format indication physical channel (PCFICH), and the like.
  • SCH channel synchronization channel
  • PBCH broadcast channel
  • PCFICH control format indication physical channel
  • the interference of the common channel between the HeN B and the eNB can be reduced by staggering the common channel of the HeNB and the eNB.
  • FIG. 2 is a flow chart of an embodiment of a method for wireless data reception according to an embodiment of the present invention.
  • step 201 searching for a common channel of the eNB
  • Step 202 Receive data transmitted on a common channel of an eNB.
  • Step 203 Search for a channel of the HeNB that is offset from the common channel of the eNB in the frequency domain and/or the time domain;
  • Step 204 Receive wireless data transmitted on a common channel of the HeNB.
  • the order of the steps 201, 202, 203, and 204 is not strictly limited.
  • the data may be received while searching, and the order of searching for the common channel of the eNB and the HeNB is not limited.
  • the UE before searching for the common channel of the HeNB, includes: searching by the UE according to the offset specified by the system.
  • the offset is determined by the system implementation, that is, a fixed offset; or the UE obtains the dynamically specified offset of the eNB according to the air interface message.
  • the UE may set a switch to decide whether to perform a SCH/PBCH search of the HeNB.
  • the location information may be used to determine that the UE determines its location. If the UE arrives near the HeNB, the HeNB is performed according to the offset.
  • the location determination may be performed in the following manner:
  • the location information of the UE may have many methods, for example, using GPS, or a neighboring macro cell list of the HeNB saved by the UE to determine whether the UE is near the HeNB.
  • the former method for determining the position by using the GPS is: confirming that the UE is in the vicinity of the HeNB according to the GPS location information of the UE.
  • the specific method of the latter is as follows: After the UE enters the macro cell, the system broadcast of the cell is read, and the cell identifier of the eNB cell is obtained, which is compared with the neighboring macro cell list stored by itself, and if it is included, it is considered to be near the HeNB. Judging the location information of the UE is not limited to this method.
  • searching for the common channel of the HeNB in which the symbol is offset from the eNB in the time domain includes: the UE performs a search according to a frame structure designed by the system. That is, the HeNB and the eNB are searched using the corresponding frame structure of the HeNB and the eNB, respectively.
  • the UE it is also possible for the UE to decide for itself when to start searching with the frame structure of the HeNB. For example, the above UE location information.
  • the UE can distinguish the common channel between the HeNB and the eNB by searching the common channel of the staggered HeNB and the eNB, thereby reducing interference between the two.
  • FIG. 3 is a flowchart of a first embodiment of a wireless data transmission and reception method according to the present invention.
  • Step 301 Taking the LTE system as an example, the system presets a fixed frequency band offset, and all HeNBs place the SCH and PBCH according to the offset.
  • the frequency range of an eNB cell is: 21 10 - 2130Mhz (megahertz)
  • the center frequency is 2120Mhz
  • the range of SCH and PBCH is 2119. 375Mhz - 2120. 625Mhz D
  • the HeNB's SCH, PBCH is placed in the range of 2116. 375Mhz -2117. 625Mhz.
  • Step 302 When the UE performs a cell search, for example, normally searching for 2120 Mhz of the cell center frequency, performing correlation calculation to find a peak and a subsequent corresponding cell search process. In this step, the UE searches for a cell according to an existing method.
  • a cell search for example, normally searching for 2120 Mhz of the cell center frequency, performing correlation calculation to find a peak and a subsequent corresponding cell search process.
  • the UE searches for a cell according to an existing method.
  • Step 303 the UE determines, according to the current location of the UE, whether the UE is in the vicinity of the HeNB, and if the UE is in the vicinity of the HeNB, the UE adjusts the frequency band to search for the corresponding HeNB, if the UE is not in the vicinity of the HeNB, the UE HeNB search with offset may not be performed.
  • the UE may obtain location information collected by a Global Positioning System (GPS). For example, the UE can calculate detailed location information, such as north latitude and east longitude. Or storing a neighboring macro cell list in the UE. After the UE enters the macro cell, the UE broadcasts the system broadcast of the cell, obtains the cell identifier of the eNB cell, and compares the obtained cell identifier of the eNB with the neighboring macro cell list stored by itself. The cell identifier is in the neighboring macro cell list, and step 304 is performed.
  • GPS Global Positioning System
  • Step 304 The UE performs a search according to the offset of the frequency band.
  • the above example is left to 3Mhz, that is, the common channel information of the HeNB cell is searched to the range of 2116.375Mhz-2117.625Mhz, and the effect cell search process is performed.
  • the scheme of the present invention does not limit the order between the foregoing steps 302, 303, and 304, and may search the HeNB and then search for the eNB.
  • FIG. 4 is a flowchart of a second embodiment of a wireless data transmission and reception method according to the present invention.
  • the system dynamically allocates a band offset for the HeNB, and the HeNB places the SCH, the PBCH, and the PCFCH channel according to the offset allocated to the HeNB.
  • the HeNB and the eNB obtain an offset by using the X2/S1 interface interaction information, or an operation administration manager (0AM) / SON self-organization network (SON) server sends an offset to the HeNB, or
  • an operation administration manager (0AM) / SON self-organization network (SON) server sends an offset to the HeNB, or
  • the HeNB informs the eNB that the offset is in the present example.
  • the HeNB and the eNB are adjacent to each other, that is, the data transmitted on the common channel of the HeNB and the eNB interfere with each other.
  • Step 402 When performing cell search, the UE searches for the eNB cell center frequency, performs correlation calculation to find the peak value, and the subsequent corresponding cell search process. In this step, the search process specifically for the eNB cell can be searched according to the existing search method.
  • Step 403 The eNB sends the offset allocated to the HeNB to the UE by using a system broadcast message.
  • the eNB may also send the UE to the UE through a Network Attached Storage (NAS) message.
  • NAS Network Attached Storage
  • the eNB sends the message to the RRC through a reconfiguration message or a paging message or other RRC message.
  • the radio resource control protocol (RRC) layer of the eNB tells its own physical layer that the physical layer of the eNB informs the physical layer of the UE through one frame or some time slots or some symbols.
  • RRC radio resource control protocol
  • Step 404 The UE searches for a cell of the HeNB according to the offset of the frequency band, and performs a corresponding cell search process.
  • the step of determining, by the UE itself, whether to perform an HeNB cell search with an offset may be included. For example, the method in step 303.
  • FIG. 5 is a schematic diagram of a frequency band division in a multimode eNB base station according to the present invention, where 501 is a common channel of Long Term Evolution Network (LTE), and 502 and 503 are Universal Mobile Telecommunications System (UMTS).
  • the common channel of High Speed Downlink Packet Access (HSPA), 504 to 507 are the guard bands of HSPA, 508 is a conventional Orthogonal Frequency Division Multiplexing (OFDM) subcarrier, and 509 is a supplemental 0FMD subcarrier.
  • HSPA High Speed Downlink Packet Access
  • OFDM Orthogonal Frequency Division Multiplexing
  • UMTS uses about 5 Mhz bandwidth on both sides, and LTE uses a part of bandwidth around 10 Mhz in the middle.
  • the range of UMTS in the figure is 2000 Mhz-2004 Mhz
  • LTE is 2005 Mhz-2014Mhz
  • UMTS is 2015 Mhz-2020 Mhz
  • the guard bands are respectively from 2004Mhz-2005Mhz, 2014 Mhz-2015 Mhz.
  • the eNB can inform the UE through the air interface message that the offset is shifted from the intermediate frequency point by 6Mhz, that is, the SCH of the HeNB, and the range of the PBCH is 2004 Mhz - 2005. 25 Mhz.
  • the offset described in step 401 may be such that the frequency band of the HeNB common channel is placed in the guard band, and since the common channel of the eNB and the HeNB is distinguished in the frequency band, no interference is generated.
  • FIG. 6 is a time domain diagram of an SCH channel of an eNB according to an embodiment of the present invention
  • FIG. 6b is a time domain diagram of a SCH channel of a HeNB according to an embodiment of the present invention
  • FIG. 7a is a PBCH of an eNB according to an embodiment of the present invention
  • Channel time domain diagram is a PBCH channel time domain diagram of the HeNB according to an embodiment of the present invention.
  • the P-SCH and the S-SCH are the primary and secondary channels of the primary homogeneous channel (PSCH), which together become the PSCH.
  • the diagonal line indicates the P-SCH
  • the dot shadow indicates the S-SCH.
  • the PBCH channel occupies the position of the first 4 symbols of the first time slot, where the PBCH is indicated in gray.
  • the PBCH channel occupies the position of the first 4 symbols of the 2nd time slot, where the PBCH is indicated in gray.
  • the HeNB does not necessarily occupy the second and thirteenth slots, for example, it may occupy the 3rd and 14th slots, etc., as long as the SCH frame of the HeNB.
  • the structure is different from the SCH frame structure of the eNB, and interference can be eliminated without overlapping in the time domain.
  • the PBCH channel of the HeNB is not necessarily limited to the first four symbol positions of the second time slot, for example, the first four symbol positions of the third time slot, as long as the PBCH frame structure of the HeNB and the eNB are
  • the PBCH frame structure is different, for example, such that the common channel of the eNB and the HeNB does not overlap in the time domain, so that interference can be eliminated.
  • the frame structure of the HeNB common channel is adjusted to separate the common channel of the eNB and the HeNB from the time domain, thereby avoiding mutual interference.
  • synchronization between the HeNB and the eNB may be implemented through a synchronization network, such as the 1588 protocol, or through GPS.
  • a GPS device is installed on each of the HeNB and the eNB to communicate with each other.
  • the HeNB may also synchronize with the eNB by reading the SCH channel of the eNB.
  • the UE can obtain the common channel information of the HeNB according to the analysis of different frame structures while searching for the eNB cell, so that the UE can search for the HeNB cell.
  • Whether the UE performs the search of the HeNB frame structure may be performed according to the method in step 303 of the foregoing example, and details are not described herein again.
  • FIG. 8 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the common channel of the HeNB and the eNB is in the frequency domain And/or staggered in the time domain, the HeNB and the eNB are configured to perform data transmission on the staggered common channel.
  • the eNB is further configured to send a frequency band offset of the common channel of the HeNB and the eNB in the frequency domain to the HeNB and/or the user terminal UE.
  • the eNB and the HeNB are configured to transmit data in a different frame structure to the common channel in the time domain.
  • the interference of the common channel between the HeN B and the eNB can be reduced by staggering the common channel of the HeNB and the eNB.
  • FIG. 9 is a schematic structural diagram of a user terminal UE according to an embodiment of the present invention.
  • a search unit 901 configured to search for a common channel of the macro base station eNB, and search for a common channel of the HeNB that is offset from the common channel of the eNB in the frequency domain and/or the time domain; The receiving wireless data transmitted on a common channel.
  • the UE can distinguish the common channel between the HeNB and the eNB by searching the common channel of the staggered HeNB and the eNB, thereby reducing interference between the two.
  • the terminal provided in this embodiment may perform the steps performed by the UE in the foregoing method embodiment, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of still another embodiment of a user terminal UE according to the present invention.
  • the search unit 1001 and the receiving unit 1002 included in the UE are substantially the same as the foregoing embodiment, and further include a location information acquiring unit 1003, configured to acquire location information of the UE, and when confirming that the UE is in the vicinity of the HeNB, A search is initiated on the common channel that triggers the search unit 1001 to the HeNB.
  • the location information acquiring unit 1003 acquires the cell identifier of the current eNB, and matches whether the cell identifier exists in the neighboring macro cell list stored by the UE, and if it exists, passes the search unit 1001 to the offset.
  • the frequency band searches for the common channel of the HeNB.
  • the location information acquiring unit 1003 may be further configured to obtain The global satellite positioning (GSP) location information of the current UE, if the UE acquires the GPS location information of the UE by using the location information acquiring unit 1003, according to the location information, if the UE arrives near the HeNB, the search unit is used. 1001 searches for the common channel of the HeNB to the shifted frequency band.
  • GSP global satellite positioning
  • the UE receives a frame structure of the HeNB common channel that is different from a frame structure of the eNB common channel.
  • the UE can distinguish the common channel between the HeNB and the eNB by searching the common channel of the staggered HeNB and the eNB, thereby reducing interference between the two.
  • the beneficial effects of the embodiments of the present invention are that the interference problem of the HeNB and the eNB on the common channel is solved by staggering the common channels of the HeNB and the e NB in the frequency domain and/or the time domain.
  • the foregoing method includes the steps of the foregoing method embodiments, and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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

Abstract

L'invention porte sur une méthode et un dispositif de transmission sans fil de données dans un système de communication. La méthode consiste: à échelonner les canaux communs d'un nœud HeNB et d'un nœud eNB dans le domaine fréquentiel et/ou le domaine temporel, et à effectuer la transmission de données dans les canaux communs échelonnés. On résout ainsi le problème des interférences lors de la transmission sans fil de données entre le HeNB et le eNb.
PCT/CN2009/071461 2009-04-24 2009-04-24 Méthode et dispositif de transmission sans fil de données dans un système de communication WO2010121437A1 (fr)

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CN200980123750.5A CN102077667B (zh) 2009-04-24 2009-04-24 一种通信系统中无线数据传输的方法和装置

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