JPWO2004077871A1 - Base station, terminal, and communication system - Google Patents

Base station, terminal, and communication system Download PDF

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JPWO2004077871A1
JPWO2004077871A1 JP2004568753A JP2004568753A JPWO2004077871A1 JP WO2004077871 A1 JPWO2004077871 A1 JP WO2004077871A1 JP 2004568753 A JP2004568753 A JP 2004568753A JP 2004568753 A JP2004568753 A JP 2004568753A JP WO2004077871 A1 JPWO2004077871 A1 JP WO2004077871A1
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terminal
base station
period
processing unit
periodic
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若林 秀治
秀治 若林
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三菱電機株式会社
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Priority to PCT/JP2003/002267 priority Critical patent/WO2004077871A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements

Abstract

The base station includes a receiving unit that periodically transmits quality information indicating a current communication state transmitted from the terminal to the base station, and a periodic processing unit that calculates and adds a variable time offset with respect to the reception timing of the quality information. Prepare. The terminal also includes a transmission unit that transmits quality information and a periodic processing unit that calculates and adds a variable time offset with respect to the transmission timing of the quality information.

Description

  The present invention relates to a base station, a terminal, and a communication system in wireless packet communication.

A W-CDMA (Wideband Code Multiple Access) method is known as a method of packet communication in a mobile communication system. Among them, there is HSDPA (High Speed Downlink Packet Access) as a method specialized in high-speed communication. HSDPA is a communication method intended for high-speed communication in the downlink.
There is an adaptive modulation method as a technical feature of HSDPA. The adaptive modulation scheme is a scheme in which a terminal transmits a packet by switching the modulation scheme, coding rate, and the like to those optimal for the current propagation state, thereby enabling efficient high-speed transmission. The base station periodically receives quality information CQI (Channel Quality Indicator) corresponding to the current propagation state from the terminal, and determines an optimal modulation scheme and coding rate based on the quality information.
Transmission of quality information CQI from terminals existing in a cell to the base station is performed at a constant cycle. This period is selected from k = {0, 1, 5, 10, 20, 40, 80} × 2 ms, and is notified to each terminal from the base station. However, since most of the period k is set to a multiple of 5, once a collision of transmission timings of quality information occurs between terminals, a collision may occur periodically at intervals of a common multiple of the period. High nature. When a transmission timing collision occurs, transmissions at a specific time are concentrated and the amount of interference increases. In the CDMA system, when the amount of interference increases, the capacity of the system is limited, and the utilization efficiency of radio resources decreases. Therefore, it is desirable to average the amount of interference and keep it as low as possible.
As a technique for preventing the occurrence of interference due to transmission / reception of control information between a base station and a terminal in a conventional mobile communication system, for example, in the radio telephone apparatus disclosed in Japanese Patent Laid-Open No. 8-51665, a base station Dynamically changes the transmission timing of control information transmitted to the mobile station during the standby operation of the mobile station, while the mobile station receives control information in response to the dynamic change of the transmission timing on the base station side. The timing is dynamically changed.
In addition, as an example of a method for determining the start timing of the control slot allocation processing to each base station in a conventional mobile communication system, there is a technique disclosed in Japanese Patent Laid-Open No. 8-191477. In this technique, a plurality of radio base stations are grouped, and a control slot allocation process is executed in parallel by a plurality of base stations belonging to different groups. Within each group, control slot allocation processing is executed in sequence according to the local base station number, and after each base station once shifts to the operating state, the slot reassignment processing is repeated, so that it finally becomes another station. A method of securing a control slot without interference is disclosed.
The present invention has been made to solve the above-described problems, and obtains a base station and a terminal that realizes a reduction in collision of periodic information transmitted from the terminal to the base station and suppresses communication interference as much as possible. For the purpose.

The base station according to the present invention includes a receiving unit that receives periodic information periodically transmitted from the terminal to the base station, and a periodic processing unit that calculates and adds a variable time offset to the reception timing of the periodic information. It is provided.
As a result, it is possible to reduce the collision of periodic information transmitted from the terminal to the base station, and to suppress communication interference as much as possible.
A terminal according to the present invention adds a variable time offset to a reference cycle designated by a base station, periodically determines a transmission timing, and periodically transmits based on the transmission timing determined by the cycle processing unit. And a transmission unit that transmits the period information to be transmitted to the base station.
As a result, it is possible to reduce the collision of periodic information transmitted from the terminal to the base station, and to suppress communication interference as much as possible.
The base station according to the present invention allocates one set to a terminal from a plurality of sets of reference periods classified according to the length of the period, and from among the assigned sets based on the period information received from the terminal A cycle processing unit that selects a cycle information report cycle and a transmission unit that transmits the selected cycle information report cycle to the terminal are provided.
As a result, the period can be changed within a limited number of bits.

FIG. 1 is a channel configuration diagram between a base station and a terminal in a W-CDMA system supporting HSDPA.
FIG. 2 is a diagram showing a format of a frame transmitted on the HS-DPCCH.
FIG. 3 is a diagram showing the configuration of the base station according to Embodiment 1 of the present invention.
FIG. 4 is a diagram showing the configuration of the mobile station according to Embodiment 1 of the present invention.
FIG. 5 is a time chart showing an example of a quality information report period in communication processing by HSDPA.
FIG. 6 is a time chart in the case where an offset is added to the quality information reporting period in the communication processing by HSDPA.
FIG. 7 is a flowchart of transmission timing determination processing according to Embodiment 1 of the present invention.
FIG. 8 is a time chart showing an example of transmission timing of quality information in communication processing by HSDPA.
FIG. 9 is a flowchart of a process for calculating a transmission timing by providing a limit value for an offset according to the second embodiment.
FIG. 10 is a flowchart of a process for calculating an offset using a normal random number according to a modification of the second embodiment.
FIG. 11 is a flowchart of processing for obtaining a counter for generating pseudo-random numbers using SFN according to a modification of the second embodiment.
FIG. 12 is a flowchart of processing for obtaining a counter for generating a pseudo-random number using an uplink scrambling code according to a modification of the second embodiment.
FIG. 13 is a flowchart of a process for calculating an offset using a periodic function according to a modification of the second embodiment.
FIG. 14 is a sequence diagram of notification of quality information and reporting period k between the terminal and the base station according to the second embodiment.
FIG. 15 is a diagram showing an example of how to create a set of reporting periods k and a periodic group according to the third embodiment.
FIG. 16 is a diagram for explaining how to assign a report period to each terminal according to the third embodiment.
FIG. 17 is a flowchart of a process for determining a set of report periods k to be allocated to terminals by the base station according to the third embodiment.
FIG. 18 is a flowchart of a process for determining a reporting period k and a reporting period k by the base station according to the third embodiment.
FIG. 19 is a sequence diagram of notification of a period group, a set of report periods k, and a report period k between the terminal and the base station according to Embodiment 3.
FIG. 20 is a flowchart of periodic group assignment processing according to the third embodiment.
FIG. 21 is a diagram showing the configuration of the mobile station according to the fifth embodiment.

Hereinafter, in order to describe the present invention in more detail, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a channel configuration diagram between a base station and a terminal in a W-CDMA system supporting HSDPA. In the figure, BCH (Broadcast Channel), HS-SCCH (High Speed Shared Channel), and HS-DSCH (High Speed Downlink Shared Channel) are downlink channels, and are common to each terminal in the cell. . HS-DPCCH (High Speed Dedicated Physical Control Channel for HS-DSCH) is an uplink channel. Further, DPCH (Dedicated Physical Channel) is a channel that is individually set for communication between the base station and each terminal, and is set for both uplink and downlink during communication. DPCH is used bidirectionally for user data communication such as voice and higher layer signaling. Note that the base station may be divided into a base station apparatus serving as a terminal point of wireless communication and a base station control apparatus for controlling the base station apparatus depending on the system.
Next, the flow of communication processing between the base station 101 and the terminal 100 will be briefly described.
The base station 101 broadcasts various types of information to each terminal existing in the cell using the BCH. In the frame transmitted by BCH, a counter value called SFN (System Frame Number) for synchronizing between the base station and the terminal is embedded, and all terminals in the cell receive this SFN.
The base station 101 transmits packet data to the terminal 100 in the cell using HS-DSCH. At this time, the base station 101 transmits packet control information using HS-SCCH. The packet control information includes information indicating a modulation scheme, a coding rate, and the like necessary for demodulating packet data transmitted using HS-DSCH. Each terminal in the cell receives these pieces of information, and if it is addressed to itself, starts demodulation of packet data using the received control information. If it is not for you, ignore it. When the terminal 100 demodulates the received packet data, the terminal 100 performs error detection on the demodulated data. If there is no error in data, terminal 100 transmits ACK to base station 101 using HS-DPCCH. If there is an error in the data, a NACK is transmitted.
Also, terminal 100 periodically transmits quality information CQI measured based on downlink propagation status to base station 101 using HS-DPCCH. Based on the received quality information CQI, the base station 101 switches the modulation scheme, coding rate, etc. to optimum values according to the propagation status.
Here, FIG. 2 shows a format of a frame transmitted by the HS-DPCCH. HS-DPCCH uses 3 slots for one transmission. As shown in the figure, one slot is used for ACK / NACK transmission, and two slots are used for quality information CQI transmission. However, these two are not necessarily transmitted simultaneously. The 3 slots combined together are called a subframe. Since one frame has 15 slots, 5 subframes are arranged in one frame.
Next, the operation inside the base station 101 will be described. FIG. 3 shows a configuration of base station 101 according to Embodiment 1 of the present invention. The operation at the time of data transmission of the base station 101 will be described with reference to FIG.
The SFN counter 200 counts a counter value for synchronization transmitted using BCH. The counter is counted up every time one frame is transmitted, and transmitted using BCH every two frames. A HARQ (Hybrid Automatic Repeat Request) processing unit 201 generates demodulation information of packet data transmitted using HS-DSCH and packet data transmitted using HS-SCCH. Data transmitted through each of these channels is modulated by a code output from the channelization code generator 203 and the scrambling code generator 204 in the modulation unit 202. The frequency conversion unit 205 raises the frequency of the data signal modulated by the modulation unit 202 to a value that can be carried. The power amplifying unit 206 amplifies the power of the signal converted to a frequency that can be carried to a desired power. The power amplified data signal is transmitted via the antenna 207.
Next, the operation of the base station 101 when receiving data will be described. When a signal from a terminal or the like is received via the antenna 207 (reception unit, transmission unit), the low noise amplification unit 208 performs a weak signal amplification. In the frequency conversion unit 209, processing for reducing the frequency of the amplified signal is performed. In the channelization code generator 211 and the scrambling code generator 210, the same code as that used for modulation in the transmission source terminal is generated. The demodulator 212 performs despreading and synthesis using the codes generated by the channelization code generator 211 and the scrambling code generator 210, and separates the signal into each channel. Among the separated channels, HSDPA control information carried on HS-DPCCH is decoded by decoding section 213. The response signal determination unit 214 determines a signal (ACK or NACK) indicating whether or not the packet transmitted from the terminal 100 is normally received from the decoded control information of HSDPA, and based on the determination result, HARQ It notifies the processing unit 201 whether or not packet retransmission is necessary. Further, the quality information determination unit 215 determines quality information CQI transmitted from the terminal 100 among the control information of HSDPA. The modulation / coding selection unit 216 determines a modulation method and the like necessary for the next packet based on the determination result in the quality information determination unit 215 and notifies each unit. Using these results, the HARQ processing unit 201 performs retransmission processing as necessary. The quality information cycle processing unit 217 (cycle processing unit) determines the quality information report cycle k (reference cycle) based on the quality information determination result by the quality information determination unit 215. In addition, the quality information cycle processing unit 217 calculates a time offset to be added to the quality information report cycle k by a process described later, and calculates the reception timing of the quality information CQI. The calculated reception timing is notified to a higher layer (base station control device) and managed for each terminal.
Based on the reception timing calculated by the quality information period processing unit 217, the decoding unit 213 decodes the quality information CQI from the signal of the corresponding channel (HS-DPCCH). That is, the decoding unit 213 decodes the signal received at this reception timing as the quality information CQI of the corresponding terminal according to the reception timing loaded with a time offset in the quality information report period k.
By performing the processing as described above, the base station 101 can obtain the quality information CQI even if the reporting period of the quality information becomes substantially variable.
Next, the operation inside the mobile station 100 will be described. FIG. 4 is a diagram showing an internal configuration of terminal 100 according to Embodiment 1 of the present invention. First, the operation at the time of transmission of the terminal 100 will be described. The HS-DPCCH data output from the HS-DPCCH processing unit 300 and the data of other channels are modulated using the codes generated from the channelization code generator 302 and the scrambling code generator 303 in the modulation unit 301. Is done. The frequency conversion unit 304 raises the frequency of the modulated data to a value that can be conveyed. The power amplifying unit 305 amplifies the power of the frequency-converted data signal to a desired power. The power-amplified signal is transmitted via the antenna 306 (transmission unit).
Next, the operation at the time of reception of the terminal 100 will be described. When data from the base station 101 is received via the antenna 306, a weak signal is amplified in the low noise amplification unit 307. In the frequency conversion unit 308, the frequency is lowered. The channelization code generator 311 and the scrambling code generator 310 generate the same code as that used for modulation in the base station 101. In the demodulator 309, despreading and combining are performed using the codes generated by the channelization code generator 311 and the scrambling code generator 310, and the signal is separated into each channel. Of each separated channel, the BCH reception result is input to the SFN counter 312. The SFN counter 312 generates an SFN counter synchronized with the base station 101 based on the received counter value.
The reception result of the HS-SCCH is input to the decoder 313, and a control signal addressed to the own terminal is extracted. Parameters for demodulating the signal transmitted by HS-DSCH are extracted from the control signal extracted by the decoder 313 and set to the demodulator 309 and the decoder 314. These parameters are a modulation scheme used at the time of modulation in the base station 101, a coding rate, and the like.
The reception result of HS-DSCH is decoded according to the modulation scheme set in decoder 314 and parameters such as coding rate. If no error is detected as a result of decoding the signal transmitted by HS-DSCH, the response signal generation unit 315 generates an ACK signal, and if an error is detected, a NACK signal is generated. Also, the decoded HS-DSCH user data is passed to the upper layer.
In addition, propagation quality estimation section 316 estimates the state of the propagation path based on the reception level in demodulation section 309. The quality information signal generation unit 317 generates quality information CQI based on the estimated propagation path state. The quality information cycle processing unit 318 (cycle processing unit) instructs the quality information signal generation unit 317 about the transmission timing of the quality information signal. When the quality information cycle processing unit 318 instructs transmission of the quality information CQI, the quality information CQI is transmitted via the HS-DPCCH processing unit 300. The transmission timing determination process in the quality information cycle processing unit 318 will be described later.
As described in relation to the background art, the quality information CQI is transmitted from the terminal to the base station at a period notified from the base station to the terminal. FIG. 5 is a diagram showing an example of a quality information report period in communication processing by HSDPA. Here, a case is shown in which four mobile terminals in a cell transmit quality information CQI. The subframe number is updated with time. As shown in the figure, the quality information CQI reporting cycle k (CQI Feedbackcycle) indicates the period from the transmission start position to the next transmission. The quality information transmission start of each terminal is determined for each terminal based on the SFN counter value from the base station. The quality information CQI is transmitted in a variable period based on the reference period k until the period k is changed. For details of the quality information CQI value, refer to 3GPP TS 25.214 V5.2.0, 6A. It is described in Chapter 2.
If the reporting cycle k of the quality information CQI is too short, communication interference will increase. Conversely, if the period k is too long, the quality information becomes old. When the quality information becomes old, it does not coincide with the actual propagation state, and the optimum modulation method and coding rate cannot be set on the base station side. Therefore, there is a possibility that a decoding error of packet data on the HS-DSCH may be caused. Therefore, an appropriate cycle k is set according to the change in the propagation state by the base station and notified to each terminal.
Next, a method for determining the transmission timing of quality information CQI according to Embodiment 1 will be described. In the first embodiment, an offset is calculated according to an algorithm set for each terminal, and the offset value is added to the quality information report cycle k. As a result, the transmission timing is fluctuated, and interference due to collision is avoided.
FIG. 6 is a diagram showing an example in the case where an offset is added to the quality information reporting period in the communication processing by HSDPA. An offset is calculated by an algorithm set in each terminal, each offset is added to the transmission timing in the original cycle, and quality information is notified at a new timing obtained as a result.
Next, the transmission timing determination process will be described with reference to FIG. FIG. 7 is a flowchart of transmission timing determination processing by the quality information cycle processing unit 318. First, quality information cycle processing section 318 checks whether or not to use a random number for the first time (step ST100). When it is determined in step ST100 that the random number is used for the first time, the quality information cycle processing unit 318 initializes the random number (step ST101).
If it is determined in step ST100 that the random number is not used for the first time, the quality information cycle processing unit 318 generates a random number (step ST105). The random number generated here is a value smaller than the period k, and is usually 1/2 or less of k. Here, 0 to k / 4 or k / 8 is used as an example, but the random number generation range may be any value as long as it can be a period that does not hinder periodic reporting.
Next, the quality information cycle processing unit 318 obtains a new transmission timing by adding the random number obtained in step ST105 as an offset to the original transmission timing (step ST107). As a result, the transmission timing can be shifted within a range in which the transmission report cycle does not change significantly.
As described above, the terminal 100 calculates an offset using the random number by the quality information cycle processing unit 318, notifies the obtained offset value to the base station 101, and uses the obtained offset value as the quality information transmission / reception cycle. Since this is added, there is an effect that the collision of quality information transmitted from the terminal 100 to the base station 101 can be reduced, and communication interference can be suppressed as much as possible.
In the above description, the offset information is calculated by the quality information period processing unit 318 of the terminal 100, and a period report based on this offset is transmitted to the base station 101. The base station 101 sets the offset value as described above. It may be calculated and transmitted to the terminal 100. In this case, the quality information cycle processing unit 217 transmits the calculated offset value to the terminal 100 via the modulation unit 202 and the antenna 207 every time. However, when the offset value is calculated on the terminal 100 side and the calculated offset value is synchronized in the same series, the offset value may not be transmitted.
Embodiment 2. FIG.
The second embodiment uses an offset value determination method different from that of the first embodiment. Various known random number generation methods can be used as the random number generation method. However, when the upper limit value of the generated random number is high, the quality information is transmitted at the transmission timing shown in FIG. 8, for example. . In the figure, terminal 1 does not add an offset to the transmission timing. As a result of adding the offset for terminal 2, the reporting interval has become too short. As for the terminal 3, as a result of adding the offset, the reporting interval is too far away.
Therefore, in order to ensure that the periodic report is always within a predetermined period, when a random number is not generated within a desired range, a limit value k_limit is set as the offset value, and an offset within an appropriate range is calculated. Can be.
FIG. 9 is a flowchart of a process for calculating by setting a limit value for the offset. Here, the offset information is calculated by the quality information cycle processing unit 318 of the terminal 100, and the obtained result is reported to the base station 101. Conversely, the base station 101 calculates the offset and reports it to the terminal 100. It may be. In addition, although a random number is used for calculating the offset, a linear congruential method may be used as a random number generation method, or another method may be used.
First, the quality information cycle processing unit 318 checks whether or not to use a random number for the first time (step ST100). When it is determined in step ST100 that the random number is used for the first time, the random number is initialized and the k_limit value is calculated (step ST101 and step ST102). Here, in step ST102, the k_limit value, for example, can be set to a range that does not exceed a half period of the period k even in the worst case by setting a value about ¼ of the period k.
If it is determined in step ST100 that the random number is not used for the first time, it is determined whether the period k is newly given or has been changed (step ST103). If it is determined in step ST103 that the period k is new or changed, a k_limit value is calculated in step ST102.
If it is determined in step ST103 that the period k is not new or changed, the degree of bias of the interference amount is determined based on the interference amount information received from the demodulation unit 309 (step ST104). . If it is determined in step ST104 that the deviation of the interference amount is small, the k_limit value is calculated in step ST102. If the amount of interference is small, the amount of fluctuation can be minimized by setting the k_limit value to about 1/8 of the period k.
If it is determined in step ST104 that there is a large amount of interference, random numbers are generated and acquired (step ST105). Once the random number has been acquired, it is next determined whether or not the acquired random number exceeds the k_limit value (step ST106). If it is determined in step ST106 that the random number exceeds the k_limit value, the process returns to step ST105 to generate and acquire the random number again.
If it is determined in step ST106 that the random number does not exceed the k_limit value, a new transmission timing is obtained by adding the obtained random number as an offset to the original transmission timing (step ST107). As a result, the transmission timing can be shifted within a range in which the transmission report cycle does not change significantly.
As described above, the terminal 100 calculates an offset using the random number by the quality information cycle processing unit 318, notifies the obtained offset value to the base station 101, and uses the obtained offset value as the quality information transmission / reception cycle. Since this is added, there is an effect that the collision of quality information transmitted from the terminal 100 to the base station 101 can be reduced, and communication interference can be suppressed as much as possible.
Moreover, since the limit value is set for the offset value to be obtained, it is possible to prevent the cycle from becoming extremely short or too long.
Further, a regular random number as shown in FIG. 10 may be used for generating a random number. In the figure, the horizontal axis represents a random number value used as an offset amount, and the vertical axis represents the occurrence probability. Normal random numbers have a normal distribution N (m, σ 2 The average m is most likely to occur and the probability of occurrence decreases as it goes to the end. For this reason, it is possible to designate a range that the random number can take by controlling the value of the standard deviation σ. For example, when the degree of fluctuation is desired to be increased, the standard deviation σ is specified to be large, and when the degree of fluctuation is desired to be reduced, the standard deviation σ is specified to be small.
In this way, by using a normal random number for the offset calculation, the range of the calculated offset value can be adjusted by changing the value of the standard deviation σ.
In addition, between the terminal 100 and the base station 101, it is necessary to synchronize the transmission timing and the reception timing of the quality information CQI. As described above, when an offset with fluctuation is generated by a random number, the terminal 100 needs to notify the base station 101 of the calculated random number every time the quality information CQI is transmitted. However, considering that one subframe, which is the minimum unit of the reporting cycle, is 2 ms, it is necessary to notify the random number by directly embedding a signal in the frame in the physical layer. This always adds extra bits for signaling in addition to user data, resulting in waste of communication.
In order to solve this problem, pseudo-random numbers may be used instead of random numbers in the offset calculation algorithm. If this method is used, there is an advantage that it is not necessary to synchronize each time a random number is generated between the terminal and the base station by implementing the same sequence pseudo-random number algorithm in the base station and the terminal.
The counter value used for generating the pseudorandom number is preferably one that is synchronized between the base station and the terminal. FIG. 11 shows a flowchart in the case of using a value based on SFN as a counter value. The following offset calculation processing is similarly performed in the quality information cycle processing unit 318 of the terminal 100 and the quality information cycle processing unit 217 of the base station 101.
First, the SFN value is read (step ST200). However, since this is the same SFN value for all terminals in the cell, a unique terminal ID value is added to the terminal (step ST201). Further, a final counter value is obtained by limiting the counter value to a value within a specified range (step ST202). Next, this value is added to the original transmission timing to obtain transmission / reception timing (step ST204).
As described above, since the quality information cycle processing unit 217 of the base station 101 and the quality information cycle processing unit 318 of the terminal 100 calculate the offset value using the pseudo random numbers generated using the same algorithm, There is no need to notify the offset value, and the amount of communication can be reduced.
In addition, when generating pseudo-random numbers, the SFN is used as a counter value synchronized between the base station 101 and the terminal 100, so there is no need to notify the counter value.
An uplink scrambling code may be used as a counter value used for pseudorandom number generation. As the uplink scrambling code, the same code synchronized with a specific base station and terminal pair is used. Furthermore, since the value is different for each terminal in the cell in order to distinguish the terminal, it is desirable as a counter value used for generating a pseudorandom number. FIG. 12 shows a flowchart of a process for acquiring a counter for generating a pseudo random number using an uplink scrambling code. The following processing is similarly performed in the quality information cycle processing unit 318 of the terminal 100 and the quality information cycle processing unit 217 of the base station 101.
First, the timing for reading the scrambling code is determined (step ST300). Next, the scrambling code is read at the determined timing (step ST301). Next, a final counter value is obtained by limiting the counter value to be within a specified range (step ST302). Next, this value is added to the original transmission timing to obtain transmission / reception timing (step ST303).
In this manner, the quality information cycle processing unit 217 of the base station 101 and the quality information cycle processing unit 318 of the terminal 100 generate scrambling as counter values synchronized between the base station 101 and the terminal 100 when generating pseudo-random numbers. Since the ring code is used, there is no need to notify the counter value.
Further, instead of a random number, a periodic function may be used for the offset calculation algorithm. If this method is used, if an initial value is given from the base station 101 to the terminal 100, then the same counter value can be generated between the base station 101 and the terminal 100 without sending the counter value every time, thereby simplifying the signaling. Can be FIG. 13 shows a flowchart of processing for calculating an offset using a periodic function. The following processing is similarly performed in the quality information cycle processing unit 318 of the terminal 100 and the quality information cycle processing unit 217 of the base station 101. However, the initial value is notified from the base station 101 to the terminal 100.
First, the initial state of the counter is checked (step ST400). If it is not initialized as a result of the determination, an initial value is acquired (step ST401). Thereafter, the counter value is incremented by 1 (step ST402). If it is determined in step ST400 that the counter has been initialized, the counter value is incremented by 1 in step ST402. Next, a remainder is calculated with the offset value for obtaining the counter value to obtain a remainder value (step ST403). Next, this value is added to the original transmission timing to obtain the transmission / reception timing (step ST404). In this way, by dividing the counter value within the range of offset to be obtained to obtain a remainder, the offset amount exceeding the limit value is not calculated.
Here, FIG. 14 shows a sequence for notifying the value of the reporting period k and the initial value when a periodic function is used for offset calculation. In the figure, a base station device refers to a portion that communicates with a terminal as a wireless communication termination point within the base station, and a base station control device refers to a processing unit for controlling the base station device within the base station.
First, (1) when a periodic function is used, an initial value is notified from the base station control device to the terminal via the base station device. Note that (1) is a sequence that is added only when an initial value is required. Next, (2) a quality report is periodically notified from the terminal to the base station apparatus. When it is necessary to change the value of the reporting period k due to the quality report from the terminal, (3) the base station notifies the base station controller of a request for changing the value of the reporting period k. (4) The base station control device determines the value of the reporting cycle k and notifies the terminal via the base station.
As described above, the quality information cycle processing unit 217 of the base station 101 and the quality information cycle processing unit 318 of the terminal 100 calculate the offset value using the same periodic function. As long as the initial value is notified, there is an effect that it is not necessary to notify the offset value every time.
Embodiment 3 FIG.
In the third embodiment, a plurality of sets of quality information reporting periods k are prepared, and each set is classified into a plurality of periods according to the value of k. A periodic group is designated for each terminal in the cell, and k groups belonging to the designated group are assigned. This increases the number of options for the reporting cycle k of each terminal, and thus collision can be avoided.
The reporting period of the quality information may be a long interval when the propagation quality is good and the change is small, and it should be a short interval when the propagation quality is greatly changed. In particular, since the change is severe in the soft handover state, it is necessary to report the quality information CQI at short intervals.
FIG. 15 shows an example of how to create a set of reporting periods k and periodic groups in the third embodiment. As shown in the figure, the set of report periods k from # 1 to # 9 is classified into three period groups depending on the length of the period.
When there is only one type of k value {k, {0, 1, 5, 10, 20, 40, 80} as in the prior art, a short period k (for example, a single digit value) can be selected. There are only two things {1,5}. When a short reporting cycle k is required, for example, from a set consisting only of small values k, such as # 1 (k = {0, 1, 2, 4, 6, 8, 10}) in the figure. If selected, the reporting period k can be set with a finer resolution. Conversely, when a long reporting cycle k is sufficient, k is set from a set of large reporting cycles k, for example, # 7 (k = {0, 20, 40, 80, 120, 160, 200}). You just have to do it.
Also, by assigning different sets of k to each terminal, there is an effect of reducing quality information report collisions. FIG. 16 shows an example of this case. As shown in the figure, terminal 1 is assigned # 1 (k = {0, 1, 2, 4, 6, 8, 10}) as a set of k, and terminal 2 is assigned # 2 (k = { 0, 1, 3, 5, 7, 9, 10}). In this way, if the value of k is set to be slightly shifted between each pair, even if the value of k is switched at the timings t1 and t2 at each terminal, there is a collision between the terminals. Hard to occur.
FIG. 17 shows a flowchart of a method for determining a set of reporting periods k to be assigned to terminals by the quality information period processing unit 217 of the base station 101 according to Embodiment 3 of the present invention. First, the allocation status to each terminal is obtained for each set belonging to the currently set periodic group (step ST500).
Next, based on the result obtained in step ST500, the group with the smallest allocation count is selected (step ST501). If there are a plurality of sets with the smallest number of allocations, one is selected by generating a random number (step ST502, step ST503).
Next, the number of times of use of the selected set is incremented by 1, and the allocation status is updated (step ST504). Next, the determined set of k is notified to the target terminal (step ST505). In this way, a set of k assigned to the terminal is determined.
The periodic group of k is changed to an appropriate periodic group depending on the content of quality information reported from the terminal, other conditions described later, and the like. FIG. 18 shows a flowchart of a method for determining k periodic groups and k by base station 101 according to the third embodiment.
Base station 101 receives and stores the quality information report from each terminal (step ST600). Next, the difference between the previously received quality information and the latest quality information is taken to examine the change (step ST601). Next, the degree of change in quality information is confirmed (step ST602). If there is no change, the process ends without changing.
On the other hand, if there is a small change, a larger k value is selected from the currently set k (step ST604). If only one of the k sets satisfies the condition of the period k selected in step ST604, the k period group is changed to one larger (step ST605, step ST606). When the periodic group is changed, the set of k is determined by the processing shown in FIG.
If there are two or more k that can be selected in step ST604 in the currently set group, a new period k is selected from the group.
If it is determined in step ST602 that there is a large change in the quality information, k having a smaller cycle is selected from the set of k (step ST607).
In step ST607, when the value of k selected from the set of k is 1/5 or less of the maximum value of k belonging to the set of k, the period group of k is changed to a smaller one (step ST608, step ST609). When the periodic group is changed, the set of k is determined by the processing shown in FIG.
When the value of k selected in step ST607 is larger than 1/5 of the maximum value of k belonging to the set of k, a new cycle k is selected from the set.
The base station 101 notifies the target terminal of the selected new report cycle k. Further, when there is a change in the periodic group, a new periodic group is also notified (step ST610).
FIG. 19 shows a sequence for changing the k period group, set, and value. In the figure, a base station device refers to a portion that communicates with a terminal as a wireless communication termination point in the base station, and a base station control device refers to a processing unit for controlling the base station device. First, (1) a quality report is periodically notified from the terminal to the base station apparatus. When the base station apparatus determines that the report cycle k needs to be changed based on (2) the quality report notified from the terminal, the base station apparatus notifies the base station control apparatus of a request for changing the value of k. To do.
If (3) k period group also needs to be changed, the base station controller determines k period group and notifies the terminal via the base station apparatus. Further, (4) the base station control device also determines a set of k and notifies the terminal via the base station. Finally, (5) the base station control device notifies the terminal of the changed value of k via the base station device.
The terminal that has received the notification of the change instruction selects a set of k in the k periodic groups designated by the base station, and makes the value of k accessible. Thereafter, the value of k that is actually used is read out from the set of k that can be referred to based on the signaling value of the limited number of bits, and the reporting period k belonging to the set of the specified period k is set.
As described above, according to the third embodiment, a plurality of sets of reporting periods k classified according to the length of the period are provided, and each group is classified into a period group. Since the base station 101 switches the k periodic groups, sets, and periods k to be notified to the terminal 100 based on the quality information notified from the terminals 100, the quality can be improved even between terminals using the same periodic group. Information reporting conflicts can be reduced.
In general, the number of bits that can be used for signaling at the time of parameter designation is a limited number of bits for reducing the transfer amount at the time of signaling. In the third embodiment, by preparing a plurality of sets of reporting periods k, it is possible to specify more types of k with a limited number of bits.
Note that the period group to be assigned to the terminal 100 may be determined based on criteria other than the quality information of the terminal 100.
For example, the base station 101 may determine a periodic group to be assigned to the terminal 100 according to the distance between the terminal 100 and the base station 101.
FIG. 20 is a flowchart of a periodic group assignment process executed by the station apparatus. This process may be performed by the base station 101 or the base station controller alone, or by both the base station 101 and the base station controller.
First, the station side devices (base station 101 and base station control device) investigate the distance D between base station 101 and terminal 100 (step ST700). Next, the station side device determines whether the distance D is a short distance, a medium distance, or a long distance by comparing with predetermined distances Th1 and Th2 (step ST701).
When it is determined that the distance to the terminal 100 is a long distance (Th1 <D), for example, the terminal 100 is at the cell edge of the base station 101. In this case, base station 101 assigns a short period group to terminal 100 in order to cause terminal 100 to perform periodic reporting in a short period (step ST702).
On the other hand, when it is determined that the distance to terminal 100 is a medium distance (Th2 <D ≦ Th1), base station 101 allocates a medium period group to terminal 100 (step ST703). Further, when it is determined that the distance to terminal 100 is a short distance, a long period group is assigned to terminal 100 (step ST704).
When the periodic group is assigned, one set is assigned from the set of report periods belonging to the assigned periodic group according to the procedure shown in FIG. Furthermore, one period k is selected from a plurality of periods included in the set and assigned to terminal 100 (step ST705).
In this way, by assigning a periodic group to a terminal based on the distance from the base station, it is possible to set a reporting period in the case of a long distance or a short distance with a good quality, in which communication quality is likely to be relatively poor. Can be assigned appropriately.
In addition, as a method for measuring the position of the terminal 100, when the terminal 100 includes a GPS (Global Positioning System) receiver, a method of specifying the position based on radio waves from a GPS satellite may be adopted. Good. Further, the position may be specified based on radio waves transmitted from the base station 101 to the terminal 100.
Further, the terminal 100 may receive signals from a plurality of base stations, and determine the distance to each base station based on the plurality of signals. For example, the terminal 100 can determine that the terminal 100 is at the cell edge, that is, at a long distance, when the radio wave conditions approaching from a plurality of base stations have the same quality as in the case of soft handover. Further, the base station 101 may determine the distance based on the radio wave intensity of the transmission signal from the terminal 100, the signal-to-noise ratio, or the like.
Further, the periodic group to be assigned to terminal 100 may be determined according to the moving speed of the terminal. For example, when the moving speed of the terminal 100 is fast, the base station 101 assigns to the terminal 100 any one of the reporting period sets # 1 to # 3 belonging to the short period group. On the other hand, when the moving speed is medium, a group of medium periods is assigned, and when the movement speed is low, a group of long periods is assigned.
As a method of measuring the moving speed of the terminal, a method of measuring the Doppler shift of the signal from the base station 101 on the terminal side, or continuously measuring the position information of the GPS receiver provided in the terminal 100, the moving coordinates There is a method of calculating the moving speed based on the above. In the case of a terminal attached to a car, speed information may be acquired from a speedometer mounted on the car and transmitted to the base station 101. In addition, any measurement method or method may be used for speed measurement.
Further, when an incoming call group used for intermittent reception or the like is determined, the base station 101 may determine a period group according to the incoming call group to which the terminal 100 belongs, and select a set of report periods from the period group.
In W-CDMA, there is only one carrier for each channel, but when using the OFDM (Orthogonal Frequency Division Multiplexing) scheme, which is the next generation communication scheme, multiple subcarriers are allocated to one channel. It is done. In this case, since each quality report is required for each subcarrier, terminal 100 measures the quality of each subcarrier and reports the measured quality to base station 101. Based on the quality change rate of each subcarrier, the station side device assigns a set belonging to the short cycle group to a subchannel with a fast quality change, and sets a set of medium cycle groups to a subchannel with a moderate change rate. Alternatively, a group belonging to the long period group may be assigned to a subchannel that changes slowly.
Further, when terminal 100 has a plurality of channels, periodic groups may be assigned according to the allowable delay amount of each channel. That is, the base station 101 assigns a set belonging to the short period group to the channel when the allowable delay amount of the channel is small, and assigns a set of the long period group to the channel when the allowable delay amount is large. assign. At this time, the allocation based on the allowable delay can be performed in units of the terminal 100. For example, a channel to be allocated to the terminal 100 may be determined based on a representative channel such as a channel with the smallest allowable delay amount among the channels of the terminal 100 or a channel with the highest priority.
Note that the various periodic group assignment methods described above correspond to each method in step ST701 by investigating decision criteria (terminal moving speed, etc.) corresponding to each method in step ST700 in the process shown in FIG. This is realized by performing any one of the allocation processes in steps ST702 to ST704 based on the result of the determination process.
Embodiment 4 FIG.
In the first to third embodiments, the reporting period of the quality information CQI is determined by various methods. In the fourth embodiment, with the same configuration, a report cycle of information other than quality information that needs to be notified periodically is determined.
For example, as an example where periodic reporting to the base station 101 is necessary, the buffer amount of the terminal 100 can be considered. Terminal 100 may notify base station 101 of the buffer amount of terminal 100 according to the reception timing determined by the same processing as in the first to third embodiments. The base station 101 acquires and decodes the buffer amount information of the terminal 100 from the signal received at the determined reception timing.
The buffer amount of the terminal 100 is the amount of transmission data of the terminal 100 that cannot be transmitted and remains in the buffer. By periodically reporting the buffer amount, the base station 101 can schedule uplink communication based on the reported buffer amount. This is particularly effective in packet transmission, which is a storage type data transmission method.
As another example, when the terminal 100 has means for measuring the moving speed of the terminal 100, the moving speed of the terminal 100 may be notified according to the same processing as in the first to third embodiments. .
Since the moving speed affects the propagation situation, the base station 101 can select an appropriate modulation scheme, encoding rate, etc. by knowing this information.
As another example, when the terminal 100 includes a GPS receiver, the position information of the terminal 100 measured by the GPS receiver may be periodically transmitted to the base station 101. Since the propagation loss with the cell can be estimated based on the location information of the terminal 100, the base station 101 can be used for the terminal 100 to determine the beam direction and the initial transmission level.
Further, the block error rate measured by the terminal 100 may be reported periodically.
Furthermore, although the above example is an example in a W-CDMA system, this invention is applicable also to the periodic report in another communication system. For example, the present invention can also be applied to CDMA2000 (1 × DV), FDM (Frequency Division Multiplexing), and OFDM.
Embodiment 5 FIG.
The configurations of base station 101 and terminal 100 shown in FIGS. 3 and 4 of the first embodiment are merely examples, and devices having various configurations can be used. In particular, the quality information cycle processing unit 217 of the base station 101 and the quality information cycle processing unit 318 of the terminal 100 can be configured using not only a dedicated circuit but also a general-purpose processor.
The general-purpose processor can serve not only the quality information cycle processing units 217 and 318 but also other configurations that can be processed by a program.
It is also possible to cause the general-purpose processor to control the operation of other circuits such as the modulation unit and to control the overall operation of the base station 101 or the terminal 100.
FIG. 21 is a diagram illustrating a configuration example of the terminal 100 using the microprocessor unit 319. The same reference numerals as those in FIG. 4 represent the same or corresponding elements.
The terminal 100 shown in FIG. 21 includes a GPS antenna 321 that receives signals from a plurality of satellites, and a GPS receiver 320 that identifies the position of the terminal 100 based on signals received by the GPS antenna 321.
The microprocessor unit 319 can generate distance and speed information from the base station 101 using position information from the GPS receiver 320.
Here, the processing of the first embodiment can be realized by the microprocessor unit 319 and a program for controlling the operation of the microprocessor unit 319. The program may be read from a computer-readable storage medium or may be transmitted via a communication line.
For example, a processor dedicated to signal processing such as a DSP (Digital Signal Processor) may be used as a component that needs to perform high-speed processing, such as the response signal determination unit 214 or the response signal generation unit 315. Good.

As described above, the base station according to the present invention is suitable for reducing the collision of quality information transmitted from the terminal to the base station and suppressing communication interference as much as possible.
As described above, the terminal according to the present invention is suitable for realizing a reduction in collision of quality information transmitted from the terminal to the base station and suppressing communication interference as much as possible.

Claims (12)

  1. A receiving unit for receiving periodic information periodically transmitted from the terminal to the base station;
    A base station comprising a periodic processing unit that calculates and adds a variable time offset to the reception timing of the periodic information.
  2. The base station according to claim 1, wherein the periodic processing unit calculates a time offset using a pseudo-random number generated by the same algorithm as that of the periodic processing unit of the terminal.
  3. The period processing unit determines a time offset within a limit value that changes according to the reference period based on a reference period of periodic transmission, and changes the reception timing by adjusting the reference period using the time offset. The base station according to claim 1, wherein:
  4. One set is assigned to the terminal from a plurality of reference period groups classified according to the length of the period, and the period information report period is selected from the assigned group based on the period information received from the terminal. A periodic processing unit to perform,
    A base station comprising: a transmission unit that transmits the selected period information report period to the terminal.
  5. 5. The base according to claim 4, wherein the period processing unit assigns a set of period information report periods to each terminal so that a set of period information reporting periods received from each terminal does not overlap. Bureau.
  6. The cycle processing unit has a plurality of report cycle groups classified according to the length of the cycle, and has a set of a plurality of cycle information report cycles for at least one report cycle group. 4. A base station according to item 4.
  7. A period processing unit that adds a variable time offset to the reference period designated by the base station and determines transmission timing;
    A terminal comprising: a transmission unit configured to transmit periodically transmitted periodic information to the base station based on the transmission timing determined by the periodic processing unit.
  8. The terminal according to claim 7, wherein the reference period is a period received from the base station, and the transmitting unit transmits the period information using a channel for transmitting control information.
  9. 8. The terminal according to claim 7, wherein the period information is quality information indicating a communication state with the base station, and the period processing unit changes the time offset each time the quality information is transmitted.
  10. The terminal according to claim 7, wherein the periodic processing unit uses a random number to generate a time offset.
  11. The terminal according to claim 7, wherein the periodic processing unit generates a time offset based on a function that generates a time offset of the same series as the periodic processing unit on the base station side.
  12. A cycle processing unit that assigns one set to a terminal from a plurality of report cycle sets having different resolutions and selects a report cycle from the assigned set based on a periodic report received from the terminal And a station side device having a transmission unit for notifying the terminal of the report cycle selected by the cycle processing unit,
    A communication system comprising: a terminal having a transmission unit that transmits the periodic report at a transmission timing based on the reporting period notified from the station side device.
JP2004568753A 2003-02-27 2003-02-27 Base station, terminal, and communication system Granted JPWO2004077871A1 (en)

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