WO2008089678A1 - Procédé de détection de station voisine et de station d'interférence et équipement de détection de station - Google Patents

Procédé de détection de station voisine et de station d'interférence et équipement de détection de station Download PDF

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Publication number
WO2008089678A1
WO2008089678A1 PCT/CN2008/070110 CN2008070110W WO2008089678A1 WO 2008089678 A1 WO2008089678 A1 WO 2008089678A1 CN 2008070110 W CN2008070110 W CN 2008070110W WO 2008089678 A1 WO2008089678 A1 WO 2008089678A1
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WIPO (PCT)
Prior art keywords
station
relay
site
listening
unit
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PCT/CN2008/070110
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English (en)
Chinese (zh)
Inventor
Zheng Shang
Jiang Li
Aimin Zhang
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008089678A1 publication Critical patent/WO2008089678A1/fr

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

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a neighbor station in a multi-hop relay communication system, a method for detecting an interference station, and a station detecting device. Background technique
  • the wireless communication signal strength in some areas is low due to path attenuation of electromagnetic waves and occlusion of buildings, and the communication quality of mobile terminals located in these areas becomes poor.
  • RS relay station
  • MS Mobile Station
  • the signal is transmitted only once between the BS and the MS.
  • a system with at least one RS is called a multi-hop relay communication system.
  • the hop count represents the number of signal transmissions between the base station and the terminal. For example, if there is an RS in the system, the signal is transmitted twice between the BS, RS and MS, so it is called a two-hop system.
  • the multi-hop system if the BS is the 0th hop, the relay station accessing the BS is the first hop, and the relay station accessing the first hop relay station is the second hop, thereby determining each relay station in the system. The number of hops.
  • FIG. 1 is a structural diagram of a multi-hop relay communication system in which a relay station is provided in the prior art, and each RS is responsible for forwarding data or signaling information between a BS and an MS.
  • RS can give the system a wider range of coverage.
  • MS5 can be covered by RS5
  • data between MS5 and BS is transmitted through a relay link formed by BS, RS2, RS4, RS5.
  • a BS or other RS that overlaps with its coverage area is an interference station of the RS; in an interference station, a BS or other RS that can communicate with it is a neighbor station of the RS.
  • a topology diagram of a multi-hop relay system wherein, the bidirectional solid arrow indicates a multi-hop relay connection for actual communication, and the double-lined arrow indicates a valid wireless connection capable of communication in an actual application,
  • the dotted one-way arrow indicates that it is in the coverage area but cannot constitute an effective wireless connection.
  • the relay link for actual communication is BS ⁇ --> RS - ->RS2 ⁇ --> RS3, BS ⁇ --> RS4 and BS ⁇ -->RS5 ⁇ --> RS6, for RS2, in practical application It is also possible to communicate with RS4 and RS6 respectively to form an effective wireless connection.
  • the neighbor set of RS2 includes not only RS1 and RS3 but also RS4 and RS6, that is, the set of neighbor sites of RS2 is ⁇ RSI, RS3, RS4, RS6 ⁇ .
  • the set of interference sites is ⁇ RS1, RS3, RS4, RS6, RS7 ⁇ , from which it can be seen that the neighbor site set is a subset of the interference site set.
  • the neighboring station and the interfering station of the relay station RS play a very important role in the multi-hop relay system, such as when a certain RS under the management of the BS or RS needs to perform relay link switching, or when the load needs to be balanced, the BS or The RS needs to discover its neighbor sites; it can also reuse resources according to the interfering sites; etc.
  • Embodiments of the present invention provide a neighboring station, a method for detecting an interference station, and a station detecting device, so that a relay station in the multi-hop communication system can discover its interference station.
  • the method for detecting a neighbor site includes:
  • the mobile station MS performs a neighboring area scan to synchronize with the scanned station;
  • the extracted site identifier is reported to the base station BS or the relay station RS serving the MS.
  • the invention provides an interference station detection method, which comprises:
  • the RS or BS receives signals transmitted by other stations;
  • the method for detecting a neighbor site includes:
  • the RS or BS receives signals transmitted by other stations;
  • Another neighbor detection method provided by the present invention includes:
  • the RS receives signals transmitted by other stations and evaluates the corresponding received signal quality; if the received signal quality satisfies a predetermined condition, it confirms that the corresponding station is its neighbor station.
  • the invention also provides a station detecting device, comprising a scanning unit, a synchronizing unit, a receiving unit, a signal analyzing unit and a transmitting unit:
  • a scanning unit configured to perform neighboring area scanning
  • a synchronization unit configured to synchronize with a transmitting station scanned by the scanning unit;
  • a receiving unit configured to receive a signal transmitted by a transmitting station synchronized by the synchronization unit; and a signal analyzing unit, configured to be used by the receiving unit
  • the received signal is parsed, and the identifier of the station is extracted from the signal;
  • a sending unit configured to send the station identifier extracted by the signal parsing unit to a relay station or a base station serving the station detecting device.
  • the invention provides a station detecting device, which comprises a scanning unit, a synchronization unit, a receiving unit, a signal analyzing unit and a storage unit:
  • a scanning unit configured to perform downlink channel scanning
  • a synchronization unit configured to synchronize with a transmitting station scanned by the scanning unit
  • a receiving unit configured to receive a signal transmitted by a transmitting station synchronized by the synchronization unit, and a signal analyzing unit configured to parse the signal received by the receiving unit;
  • a storage unit configured to store the site identifier of the transmitting site in a neighbor site list, and/or an interference site list according to a result of parsing the received signal by the signal parsing unit.
  • the RS scans the downlink channel and synchronizes with the scanned signal.
  • the RS can also evaluate the quality of the relay link according to the received signal when receiving the service data transmitted by other sites. Thereby obtaining its interference site.
  • the foregoing technical solution provided by the embodiment of the present invention can enable the relay station to detect its neighbor station or the interference node.
  • FIG. 1 is a structural diagram of a multi-hop relay communication system in the prior art
  • FIG. 2 is a topological structural diagram of a multi-hop relay communication system in the prior art
  • FIG. 3 is a structural diagram of a multi-hop relay frame in an embodiment of the present invention.
  • FIG. 4 is a topological structural diagram of another multi-hop relay system in an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a multi-hop relay frame corresponding to the multi-hop relay topology structure of FIG. 4 according to an embodiment of the present invention
  • FIG. 6 is a flowchart of a method for detecting a neighbor station and an interference station according to Embodiment 1 of the present invention
  • FIG. 7 is a flowchart of a method for detecting a neighbor station and an interference station according to Embodiment 3 of the present invention
  • FIG. 9 is a detection class in the embodiment of the present invention. An example diagram of 4;
  • FIG. 10 is a schematic diagram of a detection window in an embodiment of the present invention
  • FIG. 12 is a flowchart of a method for detecting a neighbor station and an interference station according to Embodiment 8 of the present invention
  • FIG. 13 is a structural diagram of a nine-site detection apparatus according to an embodiment of the present invention
  • Figure 14 is a structural diagram of a ten-station detecting device according to an embodiment of the present invention.
  • Figure 15 is a structural diagram of an eleventh station detecting apparatus according to an embodiment of the present invention.
  • Figure 16 is a structural diagram of a twelve-station detecting apparatus according to an embodiment of the present invention. detailed description
  • WiMAX Worldwide Interoperability for Microwave Access
  • the data frame is referred to as a multi-hop relay frame.
  • the multi-hop relay frame includes a downlink subframe and an uplink subframe.
  • the downlink subframe includes a downlink terminal subframe (ADL, Access Downlink) and a first relay subframe (FRL, First RelayLink), and the uplink subframe includes an uplink terminal subframe (AUL, Access Uplink) and the second medium.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • ADL and AUL are collectively referred to as terminal subframes for receiving and transmitting uplink data and downlink data with the MS;
  • FRL First Relay Link
  • SRL Secondary Relay Link
  • relay subframes used in RS Between, and the data transmission between the RS and the BS.
  • the ADL includes a frame header (ie, A in the figure) and downlink service burst data.
  • the frame header includes preamble (Preamble) and time-frequency resource allocation information including a frame control header (FCH), a downlink mapping (DL-MAP), an uplink mapping (UL-MAP), and a downlink channel description (DCD, Downlink Channel Description ), Upstream Channel Description (UCD, Uplink Channel Description) and other broadcast messages describing the contents of the frame.
  • the preamble is used for time-frequency synchronization between the MS and the BS or the MS and the RS; and the time-frequency resource allocation information reflects the time-frequency resource location of the user data in the downlink subframe and the uplink subframe, and the terminal can use the information.
  • a time interval TTG (Transmit/Receive Transition Gap) elapsed from the transmission state to the reception state is inserted between the downlink subframe and the uplink subframe, and is a time interval during which the BS or the RS transitions from the transmission state to the reception state.
  • a time interval RTG from the receiving state to the transmitting state is inserted between the uplink subframe and the next downlink subframe, and is a time interval in which the BS or the RS transitions from the receiving state to the transmitting state.
  • RS1 is a first hop relay station cascading with a BS
  • RS2 is a second hop relay station cascading with RS1
  • MS0, MS1, and MS2 respectively represent BSs.
  • RS1, RS2 service MS
  • To implement multi-hop relay set the transmission and reception status of the relay transmission frames of the relay stations that are cascaded to each other to be interleaved.
  • the transmission and reception status of the subsequent subframes is the same, but A multi-hop parity opposite RS, in which the transmission and reception states of the sub-frames are interleaved.
  • FIG. 5 is a schematic diagram of a multi-hop relay frame structure corresponding to the multi-hop relay topology shown in FIG. 4; in the figure, the states of the FRL/SRL of the BS are respectively transmitted/received, and the RS1 of the BS is cascaded.
  • the status of the FRL/SRL is the transmission/reception, and the FRL/SRL status of the RS2 cascaded with the R1 is the transmission/reception.
  • a relay subframe When a relay subframe is in a transmitting state, it is called a relay transmitting subframe, and when it is in a receiving state, it is called a relay.
  • the relay transmission subframe includes not only transmission data, but also a relay frame header (ie, R in FIG.
  • the relay frame header includes an identifier of the RS or the BS and a resource location used by the RS or the BS to transmit data.
  • the position of the relay frame header in the relay transmission subframe may be predefined, or may be dynamically allocated by the system when the RS or the BS accesses the system, as long as different relay frame headers do not interfere or interfere with each other. Small, and the RS cascaded up and down can find the relay frame header.
  • the relay subframe when its relay subframe is in a transmitting state, it includes both downlink data sent by the lower-level relay station and uplink data sent by the upper-level relay station or the base station.
  • Embodiment 1 The specific embodiments of the present invention are described below based on the multi-hop relay frame described above.
  • Embodiment 1
  • the MS after detecting the neighboring site by the neighboring area scanning, the MS reports the neighboring station list to the RS or the BS that serves the MS.
  • the neighboring station of the MS is the interference station of the RS or the BS serving the MS.
  • the RS or the BS synthesizes the reported result of the MS in the coverage area, that is, the interference station set can be obtained.
  • the neighboring station of the MS in addition to the BS or RS that is currently serving the MS, is a BS and/or RS that is spatially adjacent to the station, and the station serving the MS can receive the BS from the neighboring station. And / or RS transmitted signals.
  • Neighbor scanning mainly refers to the process of MS detecting neighboring cells, that is, adjusting its own receiving parameters to see if it can receive the transmitting signals of other BSs or RSs other than the currently serving BS or RS.
  • Figure 6 including:
  • the MS sends a scan request message (MOB_SCN_REQ) to the BS or RS it serves. A2. If the BS or RS agrees to perform neighbor cell scanning, the MS returns a scan request response message (MOB_SCN_RSP) to the MS, and notifies the MS to start scanning the neighboring cell.
  • MOB_SCN_REQ scan request message
  • MOB_SCN_RSP scan request response message
  • the MOB_SCN-RSP message may be sent to the MS by the BS or the RS as needed to notify the MS to perform neighboring area scanning.
  • MS performs neighboring area scanning, and synchronizes with the scanned website through the preamble Preamble.
  • the MS receives the signal transmitted by the transmitting station that performs synchronization, identifies the information of the transmitting station according to the Preamble in the terminal subframe, and/or extracts the identifier of the transmitting station from the downlink channel description DCD.
  • step A5 If the transmitting station does not exist in the neighboring site list of the MS, the transmitting station is added to the list; if the transmitting station exists in the neighboring station list of the MS, step A6 is directly performed.
  • A6 Determine whether to continue scanning the neighboring area. If the scanning continues, return to step A3; otherwise, continue to execute A7.
  • the MS sends a scan report message (MOB_SCN_REP) to the BS or the RS that serves the MS, and reports the list of the neighbors to the BS or the RS that serves the same. Therefore, the present embodiment is applicable to a legacy MS that can recognize another
  • the second embodiment of the present invention is similar to the first embodiment except that: after receiving the signal transmitted by the synchronization station, the MS extracts the identifier of the transmitting station in the relay subframe. Specifically, step A4 is modified accordingly:
  • A4a The MS receives the signal transmitted by the transmitting station that performs synchronization, and extracts the target of the station from the relay subframe.
  • the present embodiment is applicable to a new type of MS that can identify a relay subframe.
  • the MS When the station identifier carried in the relay subframe is shorter than the station identifier carried in the terminal subframe, the MS When the BS or RS reports, the amount of data will be correspondingly small, and the air interface resources can be saved.
  • the RS can also obtain the set of interfering sites and the set of neighboring sites through its own scanning detection.
  • the RS may detect before starting the relay function, or may detect during the relay process after starting the relay function. The following two cases are respectively described.
  • the RS scans, searches for the neighboring site, and/or the interfering site after the booting function is started, and reports the detection result to the BS after the relay function is enabled.
  • Figure 7 including:
  • Bl RS scans the downlink channel, and synchronizes with the scanned site through Preamble.
  • B2 RS receives a signal transmitted by the synchronized transmitting station.
  • the signal received by the RS includes a terminal subframe and a relay subframe.
  • the RS can extract the identifier of the transmitting station from the Preamble and the DCD through the terminal subframe.
  • the identifier of the transmitting station can also be extracted from the relay frame header through the relay subframe.
  • step B4 If the transmitting station does not exist in the neighbor list of the RS, add the transmitting station to the neighbor station list; otherwise, directly perform step B5.
  • B5. Determine whether to continue scanning the downlink channel. If the scanning continues, return to step B1; otherwise, continue to perform B6.
  • RS extracts the resource location occupied by the signal, and evaluates the quality of the signal.
  • step B8 Determine whether the quality of the signal exceeds a predetermined threshold. If the predetermined threshold is exceeded, determine that the transmitting station is the interference station of the RS; otherwise, perform step B5.
  • the upper-level site reports the resource location used by the transmitting site, and requests the upper-level site to return the site identifier that uses the resource location.
  • the upper-level station identifies the resource location. If the site using the resource location cannot be identified, the report is continued until it is reported to the superior site that can identify the site using the resource location.
  • the upper site returns the RS to the RS step by step using the site identifier of the resource location.
  • the B7 can be directly executed after performing B3 after the above B2; if only the neighbor site needs to be detected, and the interference station is not detected, the execution is not performed. B7 to B12.
  • the owner of the RS may be an operator or a user.
  • This RS can be considered as a dedicated relay station; and the ownership belongs to the user's RS, which can actually be regarded as a kind of dual
  • users can configure such relay stations as relay station mode or terminal mode as needed.
  • the functions of the RS cover the functions of the terminal. If some functions of the RS are suspended, look at the upper-level station. Come, the RS behaves like a terminal. For example, a user relay station can be placed near the window of the office, and the relay station provides a relay service for the user terminal in the office, which can save the battery consumption of the user terminal and provide a higher throughput rate for the user.
  • the scheme described in the third embodiment above is applicable to a dedicated relay station and a user relay station configured in a relay station mode.
  • the user relay station configured in the terminal mode before starting the relay function, it can continue to detect when idle, update, detect and update the process and implementation when its neighbor site collection, and/or the interference site collection changes.
  • the process in Example 3 is the same.
  • the RS can detect neighboring sites that have accessed the system through continuous search of the terminal subframes, and/or the relay subframes.
  • the other stations in the system cannot discover the RS; in addition, if multiple RSs in the system are in the detection state before the system is connected, they cannot discover each other. Therefore, other mechanisms are needed to ensure the integrity of the test.
  • the RS initiates the relay function
  • its terminal subframe is fixed to the MS service, and all the RSs and the terminal subframes of the BS have the same transmission and reception timing, which cannot be used for mutual discovery; and the transmission and reception status of the relay subframes of the mutually cascaded RSs They are interlaced, so you can use this feature to detect neighbors, and/or interfere with sites. For neighbors, you can use the following methods:
  • the RS receives the subframe in the relay for interception. Since the station whose opposite to the multi-hop parity is in the transmitting state, the RS can listen to the relay subframes of these stations, from the intercepted If the site identifier is extracted from the subframe, the neighbor site whose multi-hop parity is opposite can be obtained. If the RS is listening in the relay transmission subframe, since the site with the same multi-hop parity is in the transmitting state, the RS can detect A relay subframe of a station having the same multi-hop parity is heard, and thus a neighbor site having the same multi-hop parity is obtained; when the two are implemented in combination, all of their neighbor sites can be obtained. For the detection of the interfering site, since the neighboring site of the RS is also a dry site, the above method of detecting the neighboring site is also applicable to the detection of the dry site. The above several cases are described below.
  • Embodiment 4 With this embodiment, after starting the relay function, the RS detects and acquires a neighbor site opposite to its multi-hop parity, and/or interferes with the site.
  • the implementation of the method is similar to that of the third embodiment. The difference is that the RS is detected after the trunk function is enabled. At this time, all RS and BS terminal subframes are used for serving the MS, so the RS can only be in the relay subframe. The detection is performed, and thus only the relay subframe of the signal can be received, and then the neighboring station is acquired according to the relay subframe, and/or the interference station is acquired. Specifically, the steps B2 and B3 are modified accordingly:
  • the RS receives the subframe in the relay receiving subframe and receives the subframe from the relay of the synchronized transmitting station;
  • B3a Searching for a relay frame header from the relay transmission subframe, and extracting an identifier of the transmitting station. If the extraction succeeds, confirm that the site is a neighboring site of the RS; otherwise, execute B7.
  • B7 can be directly executed after performing B3a after the above B2a; if only the neighboring site needs to be detected, and the interfering site is not detected, it is not executed. B7 to B12.
  • the RS listens on the relay transmission subframe, that is, it can detect the relay subframe of the same site with the same multi-hop parity, and obtain the neighbor site with the same multi-hop parity; therefore, the RS can be made.
  • the relay transmission subframe the transmission of the relay frame header is suspended, and the relay frame header for continuously listening to other stations is referred to as a transmission subframe listening mode for convenience of description.
  • the RS mainly listens to the relay frame header, but can further obtain the more accurate relay link quality information by listening to the RL-MAP and transmitting the data block.
  • the RS that is listening in this mode does not transmit the relay frame header, and therefore cannot transmit the own relay data, but can transmit the cooperative relay data.
  • the continuous monitoring of the transmitted subframe is controlled, for example, to control that only one RS is in the listening state at the same listening moment.
  • the previous hop and the next hop node must be notified in advance by several frames, and the start hopping mode of the RS is received when the previous hop and the next hop node receive the RS. After the message is notified, the data or message sent to the RS is adjusted to ensure that the RS does not have the data or message that must be sent by itself at the listening time.
  • the BS can coordinate whether the RSs in the control system initiate the continuous subframe listening mode; for an RS, the RS can send a request for continuous listening to the BS.
  • the BS may actively send a message for suggesting interception to the RS according to the status of each RS in the system.
  • the BS actively sends a suggested listening parameter to the RS, and the RS starts the listening according to the parameter, detects the neighboring site with the same multi-hop parity, and/or the interference site. Referring to FIG. 8, the following process is included.
  • the Cl and the BS actively send a relay listening request response message to the RS, where the message carries the listening parameter value recommended by the BS to the RS; the listening parameter includes the starting listening frame number and the number of consecutive listening frames;
  • the listening frame number indicates that the multi-hop relay frame of the transmitting subframe listening mode is started.
  • the multi-hop relay frame that starts the transmitting subframe listening mode is the starting listening frame.
  • the RS determines whether to listen according to the value of the listening parameter suggested by the BS, and if the interception is performed, sends a relay listening notification information entity including the value of the listening parameter to the upper and lower stations of the RS; otherwise, the notification The BS cannot listen according to the recommended listening parameter value and ends the process.
  • the upper and lower stations of C3 and RS adjust the communication data to be sent to the RS according to the parameter value to ensure that the RS does not have data or messages that must be sent by itself at the listening time.
  • step C8 Determine whether the number of monitored frames reaches the number of consecutive listening frames recommended by the BS. If not, return to step C5 and continue to monitor the next frame; otherwise, perform step C9.
  • C9. Determine whether to report the neighbor site list to the BS, and/or the interference site list, and if yes, report to the BS; otherwise, directly execute C10.
  • step C12 Determine whether the quality of the signal exceeds a predetermined threshold. If the predetermined threshold is exceeded, determine that the transmitting station is the interference station of the RS; otherwise, perform step C8.
  • the RS reports the resource location used by the interfering site to its superior site, and requests the superior site to return the site identifier of the interfering site using the resource location;
  • the upper-level station identifies the resource location, and if the interference site that uses the resource location cannot be identified, the reporting is continued until it is reported to the identifiable superior site.
  • the identifiable superior station returns the site identifier of the interference site using the resource location to the RS step by step.
  • the C11 can be directly executed after C5 is not executed after C5; if only the neighbor site needs to be detected, and the interference station is not detected, it is not executed. C11 to C16.
  • the RS sends a relay listening request to the BS according to the load situation and/or the constraint condition, and performs interception according to the listening parameter negotiated with the BS, and detects the neighbor site with the same multi-hop parity.
  • the advantage is that due to the constraints on the RS listening parameters, the probability of different RS requests for the same listening parameters can be reduced to a certain extent, thereby avoiding a collision between multiple RSs.
  • the implementation manner is similar to that of Embodiment 5, except that before the RS detects the neighboring station and/or the interfering station, the interception parameter value has a negotiation process with the BS. Specifically, replace C1 to C4 with Cla to C8a below:
  • the Cla and the RS send a relay listening request message to the BS, where the interception device carries the request for interception, and the RS can determine the listening parameter value according to the load and the like.
  • the system can also set a unified constraint condition. In order to reduce the probability that different RSs request the same listening parameter value, the RS may determine the listening parameter value according to the constraint condition.
  • step C2a BS determines whether the RS is allowed to listen according to the requested listening parameter value, and if it agrees to listen, performs step C3a; otherwise, performs step C4a.
  • C3a returns a relay listening request response message indicating consent to the interception to the RS, and proceeds to step C5a.
  • BS determines the suggested listening parameter value, and returns a relay listening request response message containing the suggested parameter value to the RS.
  • the BS When the BS does not agree to the interception of the value of the interception parameter requested by the RS, it may also return a response message indicating rejection of the interception to the RS, and the process ends.
  • step C6a is directly executed; if the response message returned by the BS includes the recommended listening parameter, the execution is performed. Step C7a.
  • C6a and RS determine whether to listen according to the listening parameters recommended by the BS. If the interception is performed, proceed to step C7a; otherwise, notify the BS that the interception cannot be performed according to the suggested listening parameter value, and the process ends.
  • the upper-level and lower-level stations send a relay listening notification information entity including the value of the listening parameter
  • the upper-level and lower-level nodes adjust the communication data to be sent to the RS according to the parameter value, so as to ensure that the RS is in the detect There is no data or message that must be sent by the listener at the moment.
  • the following is a specific example to describe how to constrain the RS listening parameters to avoid multiple RS listening collisions.
  • a plurality of detection classes are defined in the BS, and each detection class defines a listening period (hereinafter referred to as a detection window), and the detection class parameters include a startup listening frame number and a continuous listening frame number.
  • the detection class parameter may also include a detection period so that the RS can periodically initiate the listening.
  • Figure 9 shows an example of a detection class of 4, where "01" represents the listening window corresponding to the neighbor detection class - I, "02” represents the listening window corresponding to the neighbor detection class - II, and “03” indicates A listening window corresponding to the neighbor detection class -III, "04” indicates a listening window corresponding to the neighbor detection class -IV; wherein the number of consecutive listening frames of the four detection classes is K, and the latter detection class is specified
  • the listening start frame is the frame where the end detection of the previous detection class is located; if the start detection frame number of the detection class I is P, the start detection frame number P + K of the detection class II is detected, and the detection class III is started.
  • the listening frame number is P + 2K
  • the starting listening frame number of the detecting class IV is P + 3K
  • four detecting classes appear periodically, with a period of 4K. It can be understood that this example is a special case given for convenience of description. In practical applications, the number of consecutive listening frames of each detection type may be different, and the detection start frame of the latter detection type may be set in the detection of the previous detection type. Window knot A frame after the bundle.
  • the BS may allocate an appropriate detection class to the RS in the RS access system or other appropriate time to constrain the listening parameters of the RS.
  • the BS may The parameter value of the detection class assigned to it is the listener parameter value of its request.
  • the BS may determine whether to agree according to the principle that only one of the detection types is the same and the hop count has the same parity, and only one of them is allowed to listen, and The proposed listening parameter value is determined by disagreeing with the listening parameter value requested by the RS.
  • the RS may arbitrarily select one or more of the relayed transmit subframes to listen in the detection window; "A” in the figure indicates the downlink terminal subframe, “B” " indicates a relay transmission subframe, “C” indicates an uplink terminal subframe, and “D” indicates a relay reception subframe.
  • Start_frame 16 Starts the frame number for listening
  • Prame—number 2 The number of frames continuously monitored (1, 2, 3, 4)
  • Padding fills bits so that the entire IE contains integer bytes
  • the neighbor sites with the same multi-hop parity and/or the interference station are detected by performing interception in the relay frame header of the relay transmission subframe.
  • the RS may also be removed in the relay transmission subframe.
  • a resource location other than the relay frame header is intercepted (hereinafter referred to as a listening window) to detect a neighbor site with the same parity.
  • the listening window When selecting the listening window, it should choose not to overlap with the RS transmitting resources, that is, the period during which the RS does not need to send data, and should also consider the influence of factors such as sufficient transmitting energy or data, transmission and reception switching time, and signal synchronization of the target node; You can also constrain the selection of the listening window according to the constraints set by the system (such as the detection class described above).
  • the RS automatically selects a listening window to detect a neighboring site with the same multi-hop parity in a certain period of the relay transmitting subframe.
  • the method includes:
  • the RS may choose to listen in the listening window of a certain relay transmitting subframe, or may select to transmit in several consecutive relay transmitting subframes.
  • D3. Determine whether the data energy exceeds a predetermined threshold. If the predetermined threshold is exceeded, determine that the service data is transmitted by a neighboring station; otherwise, resume the normal mode and end the process.
  • the upper-level station identifies the resource location, and if the site using the resource location cannot be identified, the report is continued until it is reported to the identifiable superior site.
  • the superior site returns the RS to the RS using the site identifier of the resource location.
  • the upper-level site only returns one site identifier, it means that the user of the resource is found. Because the upper-level site allocates the resource to other non-RS interfering sites at the same time, when the upper-level site returns multiple site identifiers, the RS needs to be Continue to listen through the listening window, and combine multiple results to determine which of the sites is the interference site.
  • the superior site can also provide the RS with suggestions for the resource location for the next listening while returning the site ID.
  • D7 Determine whether the quality of the relay link meets a predetermined condition, and if the condition is met, confirm that the station is a neighboring station of the RS; otherwise, confirm that the station is only an interference station of the RS, and execute D10.
  • step D8 If the site does not exist in the neighbor list of the RS, add the site to the neighboring site list; otherwise, go directly to step D9.
  • step D10 If the site does not exist in the interference site collection of the RS, add the site to the dry In the list of scrambling sites, go to step D9; otherwise, execute D9 directly.
  • the RS automatically selects to start the interception in a certain period of the relay transmission subframe, and the interception result and the feedback message may need to be transmitted between the stations at various levels when determining the site identifier of the resource location. Therefore, the cost of system resources may be generated.
  • the BS may also provide the RS with the monitoring information such as the site identifier and the resource location information that are monitored according to the RS that has accessed the network and the relay resources allocated by the RS, so that the RS can enable the RS to Perform purposeful listening.
  • the method provided in Embodiment 8 corresponding thereto includes the following steps:
  • the El and the BS provide the RS with a listening suggestion including the monitored station identifier and the listening resource location information according to the RS that has accessed the network and the relay resources allocated by each RS.
  • the RS is converted to the receiving state at the location of the listening resource, and if the signal is received at the resource location and the quality of the signal exceeds a predetermined threshold, it is confirmed that the listening site provided by the BS is its interference station.
  • E4 Determine whether the quality of the relay link meets a predetermined condition, and if the condition is met, determine that the station is a neighboring station of the RS; otherwise, confirm that the station is only an interference station of the RS, and execute E7.
  • step E5 If the site does not exist in the neighbor list of the RS, add the site to the neighbor list; otherwise, go directly to step E6.
  • the threshold may be set to determine whether it is an interfering site or a neighboring site.
  • the foregoing embodiment 4 describes an example in which the RS acquires a neighbor site opposite to its multi-hop parity, and/or an interference site, and Embodiment 5 to Embodiment 8 show that the RS acquires a neighbor site whose parity is the same as the multi-hop parity, and / or an instance of the dry ⁇ special site. It can be understood that the fourth embodiment can also be applied in combination with the fifth embodiment to the eighth embodiment.
  • the RS can monitor the relay receiving subframe and the relay transmitting subframe of the same multi-hop relay frame separately. It is also possible to monitor the relay receiving subframes and the relay transmitting subframes of different multi-hop relay frames respectively, and both the neighboring stations and/or the interference stations can be detected.
  • the relay station or the base station may also periodically check the interfering site, and/or the site in the neighbor site list, and delete the device from the corresponding list when the site no longer satisfies the interference/neighbor condition.
  • the site identification, the inspection method is similar to the scheme of detecting the interference site, and/or the neighbor site in the above embodiments.
  • the scanning unit 100 includes a scanning unit 100, a synchronization unit 110, a receiving unit 120, a signal analyzing unit 130, and a transmitting unit 140.
  • the scanning unit 100 is configured to perform neighboring area scanning.
  • the synchronization unit 110 is configured to synchronize with the transmitting station scanned by the scanning unit 100; the receiving unit 120 is configured to receive the signal transmitted by the transmitting station synchronized by the synchronization unit 110; and the signal analyzing unit 130 is configured to receive the received by the receiving unit 120.
  • the signal is parsed, and the identifier of the transmitting station is extracted from the signal;
  • the transmitting unit 140 is configured to send, to the relay station or the base station served by the station detecting device, the station identifier extracted by the signal analyzing unit, if the transmitting station identifier extraction is successful.
  • the station detecting device described in this embodiment may be integrated in the mobile station, and the method in the first embodiment or the second embodiment may be used for site detection.
  • the signal parsing unit may specifically include a data frame extracting unit and an identifier extracting unit: the data frame extracting unit is configured to extract the station identifier from the frame extracted from the received signal.
  • a station detecting apparatus provided by this embodiment, referring to FIG. 14, includes a scanning unit 200, a synchronization unit 210, a receiving unit 220, a signal analyzing unit 230, and a storage unit 240;
  • the scanning unit 200 is configured to perform downlink channel scanning
  • the synchronization unit 210 is configured to synchronize with the transmitting station scanned by the scanning unit 200; the receiving unit 220 is configured to receive the signal transmitted by the transmitting station synchronized by the synchronization unit 210; and the signal analyzing unit 230 is configured to receive the received by the receiving unit 220.
  • the signal is parsed; and the identifier extraction unit 250 is configured to extract an identifier of the transmitting station from the signal;
  • the storage unit 240 is configured to store, in the case that the site identifier extraction is successful, the site identifier extracted by the signal parsing unit 230 in the neighbor site list, and/or the interference site list.
  • a site detecting apparatus provided by this embodiment, referring to FIG. 15, includes a scanning unit 300, a synchronization unit 310, a receiving unit 320, a signal analyzing unit 330, and a storage unit 340;
  • the scanning unit 300 is configured to perform downlink channel scanning
  • the synchronization unit 310 is configured to synchronize with the transmitting station scanned by the scanning unit 300; the receiving unit 320 is configured to receive the signal transmitted by the transmitting station synchronized by the synchronization unit 310; and the signal analyzing unit 330 is configured to receive the signal received by the receiving unit. Analyze.
  • the signal parsing unit 330 includes a link quality evaluation unit 350, configured to evaluate a corresponding relay link quality according to the signal received by the receiving unit;
  • the storage unit 340 is configured to store the identity of the transmitting site in a neighbor site list, and/or an interference site list if the relay link quality meets a predetermined condition.
  • the embodiment provides a station detecting device.
  • a scanning unit 400 a synchronization unit 410, a receiving unit 420, a signal analyzing unit 430, and a storage unit 440 are provided.
  • the scanning unit 400 is configured to perform downlink channel scanning
  • the synchronization unit 410 is configured to synchronize with the transmitting station scanned by the scanning unit 400; the receiving unit 420 is configured to receive the signal transmitted by the transmitting station synchronized by the synchronization unit 410; and the signal analyzing unit 430 is configured to receive the received by the receiving unit 420.
  • the signal is parsed.
  • the signal parsing unit 430 includes a link quality evaluation unit 450 and a resource location extraction list. Element 460, resource location upper unit 470 and identifier acquisition unit 480. among them,
  • the link quality evaluation unit 450 is configured to evaluate the corresponding relay link quality according to the signal received by the receiving unit 420;
  • the resource location extracting unit 460 is configured to extract the resource location occupied by the signal from the signal received by the receiving unit 420;
  • the resource location reporting unit 470 is configured to report the signal occupied resource location information extracted by the resource location extracting unit 460 to the upper base station or the upper relay station of the local station detecting device;
  • the identifier obtaining unit 480 is configured to receive a transmitting station identifier corresponding to the resource location information returned by the upper base station or the upper relay station;
  • the storage unit 440 is configured to store the identity of the transmitting site in the neighbor site list, and/or the interference site list if the relay link quality meets a predetermined condition.
  • the station detecting apparatus described in the above tenth to twelfth embodiments may be integrated in the relay station or integrated in the base station; when integrated in the relay station, the apparatus may further include a sending unit, configured to list the neighboring sites. And/or the list of interfering sites is reported to the base station to which the relay station belongs.
  • the embodiment provides a site detecting device, which has a structure similar to that of the eleventh embodiment, and includes a scanning unit, a synchronization unit, a receiving unit, a signal analyzing unit, and a storage unit.
  • the scanning unit is configured to perform downlink channel scanning
  • the synchronization unit is used for synchronizing with the transmitting station scanned by the scanning unit;
  • the receiving unit is configured to receive a listening suggestion, including a listening site identifier and a listening resource location information, provided by the base station to which the device belongs, and is further configured to perform interception at the location of the listening resource, and receive the synchronization synchronized by the synchronization unit.
  • the signal analysis unit is configured to parse the signal received by the receiving unit.
  • the signal parsing unit specifically includes a link quality evaluation unit, configured to evaluate a corresponding relay link quality according to the signal received by the receiving unit;
  • the storage unit is configured to store, in the case that the relay link quality meets a predetermined condition, the interception site identifier included in the interception suggestion received by the receiving unit in the neighbor site list, and/or the interference site list.
  • the device may further include a sending unit, configured to use the neighbor site list, and/ Or the interference site list is reported to the base station to which the device belongs.
  • the station detecting apparatus described in the above thirteenth embodiment can be integrated in the relay station.
  • the MS after detecting the neighboring site by scanning, the MS reports its neighbor site identifier list to the RS or BS it serves; because the neighboring site of the MS is the interference station of the RS or BS serving the MS, RS Or the BS synthesizes the reported result of the MS in the coverage area, that is, the interference station set can be obtained.
  • the MS may extract the identifier of the transmitting station from the terminal subframe of the received signal transmitted by the synchronized station, and may also extract the identifier of the transmitting station from the relay subframe of the transmitted signal, so the present invention Embodiments are applicable to a legacy MS that can identify an OFDMA frame format or an MS that can recognize a multi-hop relay frame format.
  • the station identifier carried in the relay subframe is shorter than the station identifier carried in the terminal subframe, the amount of data of the MS to the BS or the RS may be correspondingly smaller, and the transmission is extracted from the relay subframe of the transmitted signal.
  • Site identification can save air interface resources.
  • the RS in addition to reporting according to the MS, the RS itself may scan the downlink channel, detect its interfering station, and/or the neighbor station: by performing quality assessment on the received signal transmitted by the synchronized station. , capable of detecting the interference station; when receiving the signal transmitted by the synchronized station, if the identifier of the transmitting station can be extracted from the signal, the neighbor station can be obtained; the RS can also receive other stations.
  • the quality of the relay link is evaluated according to the received signal to obtain its neighbor site.
  • the above scheme for detecting the interfering station by the RS itself, and/or the neighboring site is applicable to the case of the dedicated relay station and the relay station belonging to the user; the RS can detect before starting the relay function, by using the terminal subframe, and/or Continuous search of the relay subframe. At this time, the neighbor station that has accessed the system can be detected; however, when the detection is only performed before the RS access system, the other stations in the system cannot discover the RS; If multiple RSs are in the detection state before accessing the system, they cannot discover each other. Therefore, the present invention also provides a scheme for detecting in the relay process after the relay function is activated, which can ensure the integrity of the detection.
  • the RS can also perform interception according to the recommendation of the BS, detect its neighboring sites, and/or interfere with the site. Since the interception of the RS is performed under the assistance of the BS, blind interception is avoided, thereby improving The efficiency of listening; in addition, it can also be based on load conditions, and/or constraints by RS
  • the condition sends a relay listening request to the BS, and listens according to the listening parameter negotiated with the BS, detects the neighboring site with the same multi-hop parity, and/or the interference station, and the advantage is due to the RS listening parameter. Constraints are made to reduce the probability that different RSs request the same listening parameters to a certain extent, thereby avoiding a collision between multiple RSs.
  • modules or steps in the foregoing embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, such as a storage medium, such as ROM/RAM, disk, CD, etc. Alternatively, they may be fabricated into individual integrated circuit modules, or a plurality of modules or steps may be fabricated into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

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

Abstract

La présente invention concerne un procédé de détection de station voisine comportant: une station mobile MS balayant et synchronisant avec une station balayée ; la réception du signal transmis par la station synchronisée et l'obtention d'une identité de la station synchronisée ; le rapport de l'identité obtenue à une station de base BS ou une station relais desservant la station mobile. L'invention concerne également un procédé de détection de station d'interférence comportant: une station relais ou une station de base recevant le signal provenant d'une autre station ; l'évaluation de la qualité du signal, et la confirmation que la station de transmission est une station d'interférence de la station relais ou de la station de base si la qualité du signal dépasse une valeur seuil prédéterminée. L'invention concerne en outre un équipement de détection de station comportant une unité de balayage, une unité de synchronisation, une unité de réception, une unité d'analyse de signal et une unité de transmission. Grâce à la présente invention, dans un système de communication à relais multi-sauts, une station relais peut réaliser une détection vers sa station d'interférence et une station voisine.
PCT/CN2008/070110 2007-01-17 2008-01-15 Procédé de détection de station voisine et de station d'interférence et équipement de détection de station WO2008089678A1 (fr)

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CNA2007100074397A CN101227225A (zh) 2007-01-17 2007-01-17 干扰站点检测方法、邻居站点检测方法及站点检测装置
CN200710007439.7 2007-01-17

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