CN102088726A - Frequency multiplexing method and device - Google Patents
Frequency multiplexing method and device Download PDFInfo
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- CN102088726A CN102088726A CN200910252402XA CN200910252402A CN102088726A CN 102088726 A CN102088726 A CN 102088726A CN 200910252402X A CN200910252402X A CN 200910252402XA CN 200910252402 A CN200910252402 A CN 200910252402A CN 102088726 A CN102088726 A CN 102088726A
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Abstract
The invention discloses a frequency multiplexing method and device, which are used for improving the situation of service quality deterioration caused by same frequency interference, meeting the requirement on indoor and outdoor frequency multiplexing on the premise of not influencing service quality, and increasing the frequency spectrum utilization ratio of the system simultaneously. The method comprises the following steps of: determining an area where a terminal is positioned in a service cell; when determining that the area where the terminal is positioned in the service cell is the central coverage area of the service cell, distributing a frequency resource multiplexed by the service cell and other adjacent areas to the terminal; and when determining that the terminal is positioned in the edge coverage area of the service cell, distributing dedicated frequency resources of the service cell to the terminal. When the quality deterioration of a wireless link of the terminal is detected, the terminal is migrated from the multiplexed frequency resource onto the dedicated frequency resources, so that the same frequency interference of adjacent cells is lowered, and the service quality is enhanced.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for frequency reuse.
Background
In a current Time Division-synchronous Code Division Multiple Access (TD-SCDMA) network, a used frequency band is 2010-2025 MHz, and is divided into 9 frequency points with a frequency bandwidth of 1.6M. If the terminals of adjacent cells in the TD-SCDMA system are located on the same frequency point and the same time slot and the terminals are located in the same direction, mutual interference may be caused, that is, co-frequency and co-time slot interference may be caused. The existence of co-frequency co-slot interference can reduce the performance index KPI of the system, but the TD-SCDMA system has a narrow frequency band and a short code word, so that the capability of coping with co-frequency co-slot interference is poor.
On the other hand, in the frequency resource allocation between indoor and outdoor, the existing schemes usually employ inter-frequency networking in the indoor coverage and the macro coverage around the indoor coverage, so as to avoid mutual interference between the indoor terminal and the outdoor terminal. According to the network frequency principle of TD-SCDMA: the general indoor coverage occupies 3 frequency points, and the macro coverage around the general indoor coverage occupies 3-6 frequency points. Although such a networking scheme can avoid mutual interference between indoor and outdoor terminals, the number of frequency resources is limited, which limits the maximum capacity of indoor cells and outdoor cells.
Disclosure of Invention
The embodiment of the invention provides a frequency reuse method and a frequency reuse device, which are used for improving the condition of service quality deterioration caused by same frequency interference, meeting the requirement of indoor and outdoor frequency reuse on the premise of not influencing the service quality and improving the frequency spectrum utilization rate of a system.
The embodiment of the invention provides a frequency reuse method, which comprises the following steps:
determining the area of a serving cell where a terminal is located;
when the terminal is determined to be in the central coverage area of the service cell, allocating frequency resources multiplexed by the service cell and other adjacent cells to the terminal;
and when the terminal is determined to be in the edge coverage area of the service cell, allocating dedicated frequency resources of the service cell to the terminal.
Wherein, when the terminal is an initially accessed terminal, the determining the area of the serving cell where the terminal is located includes:
acquiring a Received Signal Code Power (RSCP) value of a Primary Common Control Physical Channel (PCCPCH) from a received Radio Resource Control (RRC) connection request;
and determining the area of the serving cell of the terminal according to the PCCPCH RSCP value.
Or, when the terminal is an initially accessed terminal, the determining the area of the serving cell in which the terminal is located includes:
after receiving the RRC connection request, transmitting PCCPCH RSCP a measurement instruction to the terminal to obtain a PCCPCH RSCP value reported by measurement;
and determining the area of the serving cell of the terminal according to the PCCPCH RSCP value.
Or, when the terminal is an initially accessed terminal, the determining the area of the serving cell in which the terminal is located includes:
and determining that the terminal is in the edge coverage area of the serving cell.
In addition, when the terminal is a connected terminal, the determining an area of a serving cell in which the terminal is located includes:
issuing PCCPCH RSCP measurement instructions to the terminal to obtain PCCPCHRSCP values reported by measurement;
and determining the area of the serving cell of the terminal according to the PCCPCH RSCP value.
In this embodiment of the present invention, after allocating the frequency resource reused by the serving cell and other neighboring cells to the terminal, the method further includes:
measuring the quality of a wireless link of the terminal in an operating slot;
adjusting the terminal to the serving cell-specific frequency resource when the radio link quality deteriorates.
The embodiment of the invention provides a frequency multiplexing device, which comprises:
a determining unit, configured to determine a region of a serving cell in which a terminal is located;
and the allocation unit is used for allocating the frequency resource multiplexed by the service cell and other adjacent cells to the terminal when the terminal is determined to be in the central coverage area of the service cell, and allocating the dedicated frequency resource of the service cell to the terminal when the terminal is determined to be in the edge coverage area of the service cell.
Wherein the determination unit includes: an acquisition subunit and a determination subunit, wherein,
the acquisition subunit is used for acquiring a Received Signal Code Power (RSCP) value of a Primary Common Control Physical Channel (PCCPCH);
and the determining subunit is used for determining the area of the serving cell in which the terminal is positioned according to the PCCPCH RSCP value.
The determining unit is further configured to determine that the initially accessed terminal is in an edge coverage area of the serving cell.
The device further comprises:
the measuring unit is used for measuring the quality of a wireless link of the terminal in an operating time slot;
a resource adjusting unit, configured to adjust the terminal to a frequency resource dedicated to the serving cell when the quality of the radio link deteriorates.
In the embodiment of the invention, the area of a service cell where a terminal is located is determined, and when the terminal is determined to be located in the central coverage area of the service cell, frequency resources which are reused by the service cell and other adjacent cells are distributed to the terminal; when the terminal is determined to be in the edge coverage area of the service cell, the exclusive frequency resource of the service cell is allocated to the terminal, so that the intra-system co-channel interference is effectively reduced, and the spectrum utilization rate of the system is improved. When the quality of the wireless link of the terminal is measured to be deteriorated, the terminal is transferred from the multiplexing frequency resource to the exclusive frequency resource so as to avoid the influence of the same frequency interference on the service transmission quality.
Drawings
FIG. 1 is a schematic diagram of frequency reuse according to an embodiment of the present invention;
FIG. 2 is a flow chart of frequency reuse according to an embodiment of the present invention;
FIG. 3 is a flow chart of frequency reuse according to an embodiment of the present invention;
FIG. 4 is a flowchart of frequency reuse according to a second embodiment of the present invention;
fig. 5 is a structural diagram of a frequency multiplexing apparatus according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a frequency reuse method, which realizes frequency resource reuse between a service cell and a neighboring cell of the service cell. Of course, the premise of implementing frequency reuse is that it must be ensured that the co-frequency interference of the terminal is small after frequency reuse, thereby avoiding affecting the service quality.
For a serving cell, because the edge coverage area of the serving cell is directly adjacent to the macro coverage area of the surrounding neighboring cells, if the edge coverage area and the macro coverage area of the surrounding neighboring cells reuse the same frequency point, larger co-frequency interference will be caused; and the isolation between part of the central coverage area of the service cell and the macro coverage of the surrounding adjacent cells is good, and even if the terminal multiplexes the same frequency points with other adjacent cells in the central coverage areas, the terminal cannot cause large interference. Therefore, the terminal in these areas reuses the frequency point resources of other adjacent areas, the system capacity of the serving cell can be effectively increased, the spectrum utilization rate is improved, and the terminal uses the dedicated frequency resource of the serving cell in the edge coverage area of the serving cell, so that the condition of service quality deterioration caused by same frequency and same time slot interference can be effectively improved, and the service quality of the terminal cannot be influenced. The frequency reuse diagram is shown in fig. 1.
In the embodiment of the invention, a Radio Network Controller (RNC) firstly determines the area of a service cell where a terminal is located, when the terminal is determined to be located in the central coverage area of the service cell, the frequency resource which is reused by the service cell and other adjacent cells is distributed for the terminal, and when the terminal is determined to be located in the edge coverage area of the service cell, the exclusive frequency resource of the service cell is distributed for the terminal.
Referring to fig. 2, the process of frequency reuse includes:
step 201: judging the area of the service cell where the terminal is located, executing step 202 when the terminal is determined to be located in the central coverage area of the service cell, otherwise, executing step 203.
The terminal may be in an initial access state or a connected state.
When the terminal is an initially accessed terminal, the RNC may determine the area of the serving cell where the terminal is located according to the signal quality of the terminal. Step 203 may also be performed by directly determining that the initially accessed terminal is in the edge coverage area of the serving cell.
When the terminal is a connected terminal, the RNC may also determine the area of the serving cell where the terminal is located according to the signal quality of the terminal.
Step 202: and allocating the frequency resources which are reused by the service cell and other adjacent cells for the terminal.
Here, it has been determined that the terminal is in the central coverage area of the serving cell, which has better isolation from the surrounding macro coverage, and therefore, the terminal is allocated with frequency resources that the serving cell reuses with other neighboring cells.
Step 203: and allocating the frequency resource exclusive to the service cell for the terminal.
Here, it is determined that the terminal is located in the edge coverage area of the serving cell, and since the edge coverage area is directly adjacent to the surrounding macro coverage, if the edge coverage area and the surrounding macro coverage reuse the same frequency point, a larger co-channel interference will be caused, and therefore, a dedicated frequency resource of the serving cell is allocated to the terminal.
In step 201 of the foregoing embodiment, when the terminal is in the initial access state, there are several ways to determine the area of the serving cell where the terminal is located, including:
1.1, an RNC receives a Radio Resource Control (RRC) request, acquires a Received Signal Code Power (RSCP) value of a Primary Common Control Physical Channel (PCCPCH) from the Received RRC connection request, and then determines the area of a serving cell where the terminal is located according to the acquired PCCPCH RSCP value. Comparing the PCCPCH RSCP value with a set value range, when the PCCPCH RSCP value is in the value range, determining that the terminal is in the central coverage area of the serving cell, otherwise, determining that the terminal is in the edge coverage area of the serving cell.
When the obtained PCCPCH RSCP value is the PCCPCH RSCP value of the serving cell, comparing the PCCPCH RSCP value with a set first threshold, and when the PCCPCHRSCP value of the serving cell is greater than the set first threshold, determining that the terminal is in the central coverage area of the serving cell; otherwise, the terminal is determined to be in the edge coverage area of the serving cell.
When the PCCPCH RSCP value obtained by the RNC is the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighboring cell of the serving cell, determining the area of the serving cell in which the terminal is located includes:
comparing the PCCPCH RSCP value of the serving cell with a set first threshold, and when the PCCPCH RSCP value of the serving cell is greater than the first threshold, determining that the terminal is in the central coverage area of the serving cell, otherwise, determining that the terminal is in the edge coverage area of the serving cell. And/or the presence of a gas in the gas,
and determining the neighbor cell with the strongest signal quality according to the PCCPCH RSCP values of the neighbor cells of the serving cell, comparing the PCCPCH RSCP value of the neighbor cell with the strongest signal quality with a set second threshold, and determining that the terminal is located in the central coverage area of the serving cell when the PCCPCH RSCP value of the neighbor cell with the strongest signal quality is smaller than the second threshold, otherwise, determining that the terminal is located in the edge coverage area of the serving cell. And/or the presence of a gas in the gas,
determining the neighbor cell with the strongest signal quality according to the PCCPCH RSCP values of the neighbor cells of the serving cell, comparing the difference value between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighbor cell with the strongest signal quality with a set third threshold, and determining that the terminal is in the central coverage area of the serving cell when the difference value between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighbor cell with the strongest signal quality is greater than the set third threshold; otherwise, the terminal is determined to be in the edge coverage area of the serving cell.
In the embodiment of the present invention, the first threshold may be a central area quality threshold, the second threshold may be an edge area quality threshold, and the third threshold may be a difference quality threshold.
1.2, after receiving the RRC request, the RNC transmits PCCPCH RSCP a measurement instruction to the terminal to obtain PCCPCH RSCP values reported by measurement, and then determines the area of the serving cell where the terminal is located according to the obtained PCCPCH RSCP values. Wherein the PCCPCH RSCP measurement instructions include: PCCPCH RSCP measurement instructions reported periodically, or PCCPCH RSCP measurement instructions reported by events.
Here, the PCCPCH RSCP values reported by the terminal measurement generally include PCCPCHRSCP value of the serving cell and PCCPCH RSCP values of neighboring cells of the serving cell, so the process of determining the area of the serving cell where the terminal is located according to the PCCPCHRSCP value is similar to the process in the above mode 1.1, and will not be repeated.
1.3, directly determining that the terminal which is initially accessed is in the edge coverage area of the service cell.
In the embodiments of the present invention, only some of the above manners for determining the area of the serving cell where the initially accessed terminal is located are listed, and other manners for determining the area of the serving cell where the terminal is located according to the signal quality of the terminal are all applicable to the embodiments of the present invention.
In step 201 of the above embodiment, when the terminal is in the connected state, it determines that the area of the serving cell where the terminal is located includes the following ways:
and the RNC transmits PCCPCH RSCP measurement instructions to the terminal, acquires PCCPCHRSCP values reported by measurement, and then determines the area of the serving cell where the terminal is located according to the acquired PCCPCH RSCP values. Comparing the PCCPCH RSCP value with a set value range, when the PCCPCHRSCP value is in the value range, determining that the terminal is in the central coverage area of the serving cell, otherwise, determining that the terminal is in the edge coverage area of the serving cell.
Wherein the PCCPCH RSCP measurement instructions include: PCCPCH RSCP measurement instructions reported periodically, or PCCPCH RSCP measurement instructions reported by events.
Here, the PCCPCH RSCP values obtained by the RNC include: PCCPCH RSCP value of the serving cell and PCCPCH RSCP values of neighboring cells of the serving cell, determining that the area of the serving cell in which the terminal is located includes:
comparing the PCCPCH RSCP value of the serving cell with a set first threshold, and when the PCCPCH RSCP value of the serving cell is greater than the first threshold, determining that the terminal is in the central coverage area of the serving cell, otherwise, determining that the terminal is in the edge coverage area of the serving cell. And/or the presence of a gas in the gas,
and determining the neighbor cell with the strongest signal quality according to the PCCPCH RSCP values of the neighbor cells of the serving cell, comparing the PCCPCH RSCP value of the neighbor cell with the strongest signal quality with a set second threshold, and determining that the terminal is located in the central coverage area of the serving cell when the PCCPCH RSCP value of the neighbor cell with the strongest signal quality is smaller than the second threshold, otherwise, determining that the terminal is located in the edge coverage area of the serving cell. And/or the presence of a gas in the gas,
determining the neighbor cell with the strongest signal quality according to the PCCPCH RSCP values of the neighbor cells of the serving cell, comparing the difference value between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighbor cell with the strongest signal quality with a set third threshold, and determining that the terminal is in the central coverage area of the serving cell when the difference value between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighbor cell with the strongest signal quality is greater than the set third threshold; otherwise, the terminal is determined to be in the edge coverage area of the serving cell.
In the embodiment of the invention, after the RNC determines that the terminal uses the frequency resource multiplexed by the service cell and other adjacent cells, the quality of a wireless link of the terminal in a working time slot can be measured, and when the quality of the wireless link is measured to be deteriorated, the terminal is adjusted to the special frequency resource of the service cell.
Wherein, measuring the wireless link quality of the terminal in the working slot comprises: the method includes measuring Interference Signal Code Power (ISCP) of a terminal in an uplink time slot or a downlink time slot, or measuring Block Error Rate (BLER) of uplink channel or downlink channel data of the terminal, or measuring uplink transmission Power or downlink transmission Power (TCP) of the terminal.
Thus, if the ISCP of the terminal in the uplink time slot or the downlink time slot is measured, the measured value of the ISCP of the terminal in the uplink time slot or the downlink time slot is compared with the set fourth threshold, and when the corresponding value of the ISCP is greater than the set fourth threshold, and/or
If the BLER of the uplink channel or the downlink channel of the terminal is measured, comparing the measured BLER value of the uplink channel or the downlink channel of the terminal with a set fifth threshold, and/or when the corresponding BLER value is larger than the set fifth threshold and/or
If the uplink or downlink TCP of the terminal is measured, comparing the measured value of the uplink or downlink TCP of the terminal with a set sixth threshold, when the value of the corresponding TCP is greater than the set sixth threshold,
and adjusting the terminal to the frequency resource exclusive to the service cell.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
In a first embodiment, referring to fig. 3, a process of terminal frequency reuse includes:
step 301: is it determined whether the terminal is in the central coverage area of the serving cell at the time of access? If so, go to step 302, otherwise, go to step 305.
Here, the RNC determines the area of the serving cell where the terminal is located, based on the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighboring cell with the strongest signal quality, which are carried in the RRC connection request. When the difference between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighboring cell with the strongest signal quality is greater than a third threshold, determining that the terminal is in the central coverage area of the serving cell, and executing step 302; otherwise, step 305 is performed.
Step 302: and allocating the frequency resources which are reused by the service cell and other adjacent cells for the terminal.
Step 303: and sending PCCPCH RSCP 1g/2a measurement event to the terminal.
Wherein, the 1g/2a measurement event of PCCPCH RSCP is a PCCPCH RSCP measurement command reported by an event, and the 1g measurement event of PCCPCH RSCP is used for measuring whether the best cell of the terminal is changed; PCCPCH RSCP, 2a, for measuring whether the terminal's best frequency has changed. The measured hysteresis parameter may set a third threshold by comparing the difference between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighbor cell with the strongest signal quality with the set third threshold.
Step 304: judging whether a 1g or 2a measurement event of PCCPCH RSCP reported by the terminal is received, if so, determining that the terminal has entered the edge coverage area of the serving cell according to the received PCCPCH RSCP, and executing step 305; otherwise, the loop waits here.
Step 305: and allocating the frequency resource exclusive to the service cell for the terminal.
Here, it has been determined that the terminal is in the edge coverage area of the serving cell, and therefore, the terminal is allocated frequency resources specific to the serving cell.
Step 306: and transmitting PCCPCH RSCP 1g/2a measurement event to the terminal, setting the hysteresis parameter as an inter-cell switching threshold, and reporting PCCPCH RSCP measurement instructions in a transmission period. Here, the periodically reported PCCPCH RSCP measurement is used to determine whether the terminal is entering the center coverage area from the edge coverage area.
Step 307: judging whether a 1g or 2a measurement event reported by the terminal PCCPCH RSCP is received, if so, determining that the terminal has entered another serving cell, and executing the step 308, otherwise, executing the step 309.
Step 308: and (4) executing the inter-cell switching for the terminal, and ending the process of terminal frequency reuse in the original service cell.
Step 309: and judging that the difference value between the PCCPCH RSCP value and the PCCPCH RSCP value of the neighboring cell with the strongest signal quality in the measurement report periodically reported by the terminal is greater than a set third threshold, if so, determining that the terminal is in the central coverage area of the serving cell, and returning to the step 302. Otherwise, return to step 307.
Example two: referring to fig. 4, the process of terminal frequency reuse includes:
step 401: it is determined that the initially accessed terminal is in an edge coverage area of the serving cell.
Step 402: and allocating the frequency resource exclusive to the service cell for the terminal.
Step 403: and issuing a 1g/2a measurement event of PCCPCH RSCP to the terminal, wherein a hysteresis parameter is set as an inter-cell switching threshold, and simultaneously issuing a 2d/2e measurement event of a neighboring cell PCCPCH RSCP and a 2f measurement event of a serving cell PCCPCH RSCP. The 2d/2e measured event hysteresis parameter of PCCPCH RSCP is set as the second threshold, and the 2f measured event hysteresis parameter of PCCPCH RSCP is set as the first threshold.
Wherein 2d of PCCPCH RSCP measures an event for measuring whether an estimate of the current frequency of use of the terminal is below a decision threshold; PCCPCH RSCP for measuring whether the estimated amount of unused frequencies of the terminal is below a decision threshold. The 2d measurement event is directed at the same-frequency adjacent region measurement, and the 2e measurement event is directed at the different-frequency adjacent region measurement, so that the judgment threshold corresponding to the measurement event is the second threshold, namely the PCCPCH RSCP value of the adjacent region is compared with the set second threshold.
PCCPCH RSCP, for measuring whether the estimated amount of the current frequency used by the serving cell is higher than the decision threshold, the 2f measurement event is for the serving cell, therefore, the measurement event corresponds to the threshold as the first threshold, i.e. the PCCPCH RSCP value of the serving cell is compared with the set first threshold.
Step 404: judging whether a 1g or 2a measurement event PCCPCH RSCP reported by the terminal is received, if so, determining that the terminal has entered another serving cell, and executing step 405; otherwise, step 406 is performed.
Step 405: and (4) executing the inter-cell switching for the terminal, and ending the process of terminal frequency reuse in the original service cell.
Step 406: it is determined whether the 2d/2e event of PCCPCH RSCP and the 2f event of PCCPCHRSCP are satisfied at the same time,
in the process of reporting events successively, in order to prevent the situation that the event reported first is not satisfied in the process of waiting for reporting other events, the opposite measurement event needs to be issued to the measurement event reported first, like the 2d event of a frequency neighboring cell needs to be issued after reporting first, the 2f event for a same-frequency neighboring cell needs to be issued, the 2e event of an inter-frequency neighboring cell needs to be issued after reporting first, and the 2f event of a serving cell needs to be issued after reporting first. Wherein the 2c event is used to measure whether an estimate of unused frequencies of the terminal is above a decision threshold.
Only when the 2d/2e event of the neighboring cell and the 2f event of the serving cell are satisfied at the same time, it can be determined that the terminal is located in the central coverage area, and step 407 is executed.
Step 407: and allocating the frequency resources which are reused by the service cell and other adjacent cells for the terminal.
Step 408: transmitting a 1i measurement event of downlink ISCP to a terminal, and setting a measured hysteresis parameter as an interference decision threshold from a central coverage area to an edge coverage area; meanwhile, an EVENT A measurement EVENT aiming at the downlink special transmitting power of the terminal is sent to the NodeB, and the measured hysteresis parameter is set as a power judgment threshold from the central coverage area to the edge coverage area.
Here, the 1i measurement event of the ISCP is used to measure whether the uplink timeslot ISCP is above a certain threshold. The EVENT A measurement EVENT is of an Iub port measurement EVENT type and is used for judging whether the current measurement value is higher than a determined threshold.
Step 409: judging whether 1i event of ISCP reported by the terminal and EVENTA event of downlink special transmitting power are received or not,
in the process of reporting events one after another, in order to prevent the event reported first from being unsatisfied with other events in the process of waiting for reporting other events, the opposite measurement event needs to be issued to the measurement event reported first. If the 1i event is reported first and then the anti-event 1h of the 1i event needs to be issued, the EVNET B event needs to be issued after the EVENTA event of the special transmitting power is reported.
Only when the 1i EVENT of the ISCP and the EVENT a EVENT of the dedicated transmission power are simultaneously satisfied, it is indicated that the radio link quality of the terminal is deteriorated, and the process returns to step 402.
According to the above frequency multiplexing method, a frequency multiplexing apparatus, see fig. 5, may be constructed, including: a determination unit 100 and an assignment unit 200.
A determining unit 100, configured to determine an area of a serving cell where the terminal is located.
An allocating unit 200, configured to allocate, to the terminal, a frequency resource that is reused by the serving cell and other neighboring cells when it is determined that the terminal is located in a central coverage area of the serving cell, and allocate, to the terminal, a dedicated frequency resource of the serving cell when it is determined that the terminal is located in an edge coverage area of the serving cell.
Wherein, the determining unit 100 may include: an acquisition subunit and a determination subunit.
And the acquiring subunit is used for acquiring the received signal code power RSCP value of the PCCPCH.
And the determining subunit is used for determining the area of the serving cell in which the terminal is positioned according to the PCCPCH RSCP value.
Here, the obtaining subunit may be configured to obtain the received signal code power RSCP value of the primary common control physical channel PCCPCH from the received radio resource control protocol RRC connection request. Or,
the obtaining subunit may also be configured to obtain an PCCPCH RSCP value reported by the terminal.
When the obtaining subunit obtains the PCCPCH RSCP value of the serving cell, the determining subunit is further configured to compare the PCCPCH RSCP value of the obtained serving cell with a set first threshold, and when the PCCPCH RSCP value of the serving cell is greater than the set first threshold, determine that the terminal is in the central coverage area of the serving cell; and when the PCCPCH RSCP value of the serving cell is less than or equal to the set first threshold, determining that the terminal is in the edge coverage area of the serving cell.
When the obtaining subunit obtains the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighboring cell of the serving cell, the determining subunit is further configured to compare the PCCPCHRSCP value of the serving cell with a set first threshold, and when the PCCPCH RSCP value of the serving cell is greater than the first threshold, determine that the terminal is in the central coverage area of the serving cell, otherwise, determine that the terminal is in the edge coverage area of the serving cell. And/or the presence of a gas in the gas,
the determining subunit is further configured to determine, according to the PCCPCH RSCP values of the neighboring cells of the serving cell, a neighboring cell with the strongest signal quality, compare the PCCPCH RSCP value of the neighboring cell with the strongest signal quality with a set second threshold, determine that the terminal is located in the central coverage area of the serving cell when the PCCPCH RSCP value of the neighboring cell with the strongest signal quality is smaller than the second threshold, and otherwise determine that the terminal is located in the edge coverage area of the serving cell. And/or the presence of a gas in the gas,
the determining subunit is further configured to determine, according to the PCCPCH RSCP values of the neighboring cells of the serving cell, a neighboring cell with the strongest signal quality, compare a difference between the PCCPCH RSCP value of the serving cell and the PCCPCH RSCP value of the neighboring cell with the strongest signal quality with a set third threshold, determine that the terminal is located in the central coverage area of the serving cell when the difference is greater than the third threshold, and otherwise, determine that the terminal is located in the edge coverage area of the serving cell.
The determining unit 100 in the embodiment of the present invention is further configured to determine that the initially accessed terminal is located in an edge coverage area of the serving cell.
In the embodiment of the present invention, the frequency multiplexing apparatus further includes: a measurement unit and a resource adjustment unit.
And the measuring unit is used for measuring the quality of the wireless link of the terminal in the working time slot.
A resource adjusting unit, configured to adjust the terminal to a frequency resource dedicated to the serving cell when the quality of the radio link deteriorates.
Wherein, if the measuring unit measures the ISCP of the terminal in the uplink time slot or the downlink time slot, the resource adjusting unit compares the measured value of the ISCP of the terminal in the uplink time slot or the downlink time slot with a set fourth threshold, and when the corresponding value of the ISCP is greater than the set fourth threshold, and/or
If the measuring unit measures the BLER of the uplink channel or the downlink channel of the terminal, the resource adjusting unit compares the measured BLER value of the uplink channel or the downlink channel of the measuring terminal with a set fifth threshold, and when the corresponding BLER value is larger than the set fifth threshold, and/or
If the measuring unit measures the uplink or downlink TCP of the terminal, the resource adjusting unit compares the measured value of the uplink or downlink TCP of the terminal with a set sixth threshold, when the value of the corresponding TCP is greater than the set sixth threshold,
and adjusting the terminal to the frequency resource exclusive to the service cell.
In summary, in the embodiment of the present invention, an RNC determines an area of a serving cell where a terminal is located, and allocates, to the terminal, frequency resources that are reused by the serving cell and other neighboring cells when the terminal is determined to be located in a central coverage area of the serving cell; when the terminal is determined to be in the edge coverage area of the service cell, the exclusive frequency resource of the service cell is allocated to the terminal, so that the intra-system co-channel interference is effectively reduced, and the spectrum utilization rate of the system is improved. When the quality of the wireless link of the terminal is measured to be deteriorated, the terminal is transferred from the multiplexing frequency resource to the exclusive frequency resource so as to avoid the influence of the same frequency interference on the service transmission quality.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (13)
1. A method of frequency reuse, comprising:
determining the area of a serving cell where a terminal is located;
when the terminal is determined to be in the central coverage area of the service cell, allocating frequency resources multiplexed by the service cell and other adjacent cells to the terminal;
and when the terminal is determined to be in the edge coverage area of the service cell, allocating dedicated frequency resources of the service cell to the terminal.
2. The method of claim 1, wherein when the terminal is an initially accessed terminal, the determining the area of the serving cell in which the terminal is located comprises:
acquiring a Received Signal Code Power (RSCP) value of a Primary Common Control Physical Channel (PCCPCH) from a received Radio Resource Control (RRC) connection request;
and determining the area of the serving cell of the terminal according to the PCCPCH RSCP value.
3. The method of claim 1, wherein when the terminal is an initially accessed terminal, the determining the area of the serving cell in which the terminal is located comprises:
after receiving the RRC connection request, transmitting PCCPCH RSCP a measurement instruction to the terminal to obtain a PCCPCH RSCP value reported by measurement;
and determining the area of the serving cell of the terminal according to the PCCPCH RSCP value.
4. The method of claim 1, wherein when the terminal is an initially accessed terminal, the determining the area of the serving cell in which the terminal is located comprises:
and determining that the terminal is in the edge coverage area of the serving cell.
5. The method of claim 1, wherein when the terminal is a connected terminal, the determining the area of the serving cell in which the terminal is located comprises:
issuing PCCPCH RSCP measurement instructions to the terminal to obtain PCCPCHRSCP values reported by measurement;
and determining the area of the serving cell of the terminal according to the PCCPCH RSCP value.
6. The method of claim 2, wherein when the obtained PCCPCH RSCP value is the PCCPCH RSCP value of the serving cell, the determining the area of the serving cell in which the terminal is located comprises:
comparing the PCCPCH RSCP value of the serving cell with a set first threshold;
when the PCCPCH RSCP value of the serving cell is greater than the first threshold, determining that the terminal is in the center coverage area of the serving cell, otherwise, determining that the terminal is in the edge coverage area of the serving cell.
7. The method of claim 2, 3 or 5, wherein when the obtained PCCPCH RSCP values are PCCPCH RSCP value of the serving cell and PCCPCH RSCP values of neighboring cells of the serving cell, the determining the area of the serving cell in which the terminal is located comprises:
comparing the PCCPCH RSCP value of the serving cell with a set first threshold, and when the PCCPCH RSCP value of the serving cell is greater than the first threshold, determining that the terminal is in the central coverage area of the serving cell, otherwise, determining that the terminal is in the edge coverage area of the serving cell; and/or the presence of a gas in the gas,
determining a neighboring cell with the strongest signal quality according to PCCPCH RSCP values of neighboring cells of the serving cell, comparing PCCPCH RSCP values of the neighboring cell with the strongest signal quality with a set second threshold, and determining that the terminal is located in a central coverage area of the serving cell when PCCPCH RSCP values of the neighboring cell with the strongest signal quality are smaller than the second threshold, otherwise, determining that the terminal is located in an edge coverage area of the serving cell; and/or the presence of a gas in the gas,
and determining a neighboring cell with the strongest signal quality according to the PCCPCH RSCP values of the neighboring cells of the serving cell, comparing a difference value between the PCCPCH RSCP value of the serving cell and the PCCPCHRSCP value of the neighboring cell with the strongest signal quality with a set third threshold, and determining that the terminal is located in the central coverage area of the serving cell when the difference value is greater than the third threshold, otherwise, determining that the terminal is located in the edge coverage area of the serving cell.
8. The method of claim 1, wherein after allocating the frequency resources reused by the serving cell and other neighboring cells for the terminal, further comprising:
measuring the quality of a wireless link of the terminal in an operating slot;
adjusting the terminal to the serving cell-specific frequency resource when the radio link quality deteriorates.
9. The method of claim 8, wherein adjusting the terminal to the serving cell-specific frequency resource comprises:
when the measured value of the Interference Signal Code Power (ISCP) of the terminal in the uplink time slot or the downlink time slot is larger than the set fourth threshold, and/or,
when the measured downstream channel data block error rate BLER after the terminal upstream channel is larger than the set fifth threshold, and/or,
when the measured uplink transmission power or the measured downlink transmission power TCP of the terminal is larger than the set sixth threshold,
and adjusting the terminal to the frequency resource exclusive to the service cell.
10. An apparatus for frequency reuse, comprising: a determination unit and an allocation unit, wherein,
a determining unit, configured to determine a region of a serving cell in which a terminal is located;
and the allocation unit is used for allocating the frequency resource multiplexed by the service cell and other adjacent cells to the terminal when the terminal is determined to be in the central coverage area of the service cell, and allocating the dedicated frequency resource of the service cell to the terminal when the terminal is determined to be in the edge coverage area of the service cell.
11. The apparatus of claim 10, wherein the determining unit comprises: an acquisition subunit and a determination subunit, wherein,
the acquisition subunit is used for acquiring a Received Signal Code Power (RSCP) value of a Primary Common Control Physical Channel (PCCPCH);
and the determining subunit is used for determining the area of the serving cell in which the terminal is positioned according to the PCCPCH RSCP value.
12. The apparatus of claim 10,
the determining unit is further configured to determine that the initially accessed terminal is in an edge coverage area of the serving cell.
13. The apparatus of claim 10, wherein the apparatus further comprises:
the measuring unit is used for measuring the quality of a wireless link of the terminal in an operating time slot;
a resource adjusting unit, configured to adjust the terminal to a frequency resource dedicated to the serving cell when the quality of the radio link deteriorates.
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| CN200910252402XA CN102088726A (en) | 2009-12-02 | 2009-12-02 | Frequency multiplexing method and device |
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| CN200910252402XA CN102088726A (en) | 2009-12-02 | 2009-12-02 | Frequency multiplexing method and device |
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