CN103051428A - PCI (precoding control indication) feedback cell determination method and system for terminal only configured with dedicated channel - Google Patents
PCI (precoding control indication) feedback cell determination method and system for terminal only configured with dedicated channel Download PDFInfo
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Abstract
The invention discloses a PCI (precoding control indication) feedback cell determination method and system for a terminal only configured with a dedicated channel. The method comprises the following steps that a network side receives a measurement report which is reported by the terminal only configured with the dedicated channel, when determining that the terminal supports an uplink closed loop to send a diversity, selecting the cell with the maximum energy of chip to noise ratio (Ec/No) value and/or the maximum received signal code power (RSCP) value as the feedback cell of the precoding control indication (PCI) of the terminal. Through the adoption of the method and the system provided by the invention, the PCI feedback of the diversity sent by the uplink closed loop of the terminal which is only configured with the dedicated channel is realized, the terminal which is only configured with the dedicated channel is enabled to obtain the feedback cell of the optimal PCI, thereby improving the system performance.
Description
Technical Field
The invention relates to the technical field of multi-antenna transmit diversity, in particular to a method and a system for determining a PCI feedback cell of a terminal only configured with a dedicated channel.
Background
The multi-antenna technology achieves higher system capacity, wider cell coverage, and better quality of service by using multiple antennas at the transmitting end and/or the receiving end. Multiple antennas at the transmitting end and/or the receiving end can be used for realizing transmitting or receiving diversity and spatial multiplexing. The transmit diversity technique is an anti-fading technique in the field of wireless communication in which a transmitting end transmits at least two signals containing the same information. These signals carrying the same information originate from at least two mutually independent signal sources. The transmit diversity technique can be divided into three basic types of space, frequency and time according to the structure and statistical characteristics of the transmitted signal sample and the difference of the wireless resources occupied by the transmit diversity technique, and the three basic types can also be combined with each other. The spatial diversity is to realize the function of anti-fading by utilizing the independence of statistical characteristics when signals reach a receiving end after passing through a channel by utilizing the difference of different transmitting positions (spatial positions). The frequency diversity is to use the statistical irrelevance characteristic of signals in different frequency bands after passing through fading channels, i.e. the difference of the fading statistical characteristics in different frequency bands, to realize the function of resisting fading (frequency selectivity). In implementation, the information to be transmitted can be modulated on carriers with irrelevant frequencies respectively for transmission. By time diversity is meant that, using a random fading signal, when the time interval between sampling points is large enough (larger than the coherence time of the transmission channel), the fading between sampling points is statistically uncorrelated, i.e. the time selective fading resistance is achieved by using the difference in the fading statistical characteristics over time.
The transmit diversity technology is divided into an open-loop transmit diversity mode and a closed-loop transmit diversity module according to whether a receiving end needs to feed back parameters needed by diversity to the transmitting end. In the open-loop transmit diversity mode, the receiving end does not feed back any additional information related to transmission to the transmitting end, and the transmitting end can use a corresponding coding technique (such as simple space-time coding) to complete transmit diversity. In the closed-loop transmit diversity mode, the receiving end needs to use a feedback channel to feed back a parameter related to transmit diversity to the transmitting end (e.g., a precoding vector required by transmit diversity, indicated by precoding indication information), and the transmitting end uses the feedback information to complete transmit diversity after receiving.
In 3GPP Release 10, a standard has been established for uplink open loop transmit diversity at a High Speed Uplink Packet Access (HSUPA) system user end (TR25.863), and a Precoding Control Indication (PCI) is introduced to discuss related contents of closed loop transmit diversity currently. Currently, the industry agrees with a Channel structure of uplink closed-loop transmit diversity, as shown in fig. 1, an uplink Channel, i.e., a Secondary-Dedicated Physical Control Channel (S-DPCCH) is added, an auxiliary pilot value is uploaded to a network side, and the network side knows a weak condition of a Channel path by using the received auxiliary pilot value and a pilot value in the Dedicated Physical Control Channel (DPCCH); a downlink channel is newly added, similar to a fractional dedicated physical channel (F-DPCH), namely, a fractional precoding indicator channel (F-PCICH), for transmitting a precoding value of uplink transmit diversity to the terminal, so as to better prevent the path fading condition. Currently, for F-DPCH, the transmission is once in 3 slots, and for compressed mode transmission, the terminal stores the last received PCI before the gap until a new precoding is received after the compressed mode transmission gap.
For soft handover, precoding control information is determined by one cell. If an enhanced dedicated channel serving cell is configured, then this cell is configured for determining the PCI; if the enhanced dedicated channel serving cell is not configured and the high speed downlink shared channel serving cell is configured, the high speed downlink shared channel serving cell is configured to determine the PCI.
However, the prior art has not provided a corresponding solution for determining the PCI of a terminal having only dedicated channels in soft handover, specifically which cell is used.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and a system for determining a PCI feedback cell of a terminal configured with only a dedicated channel, so as to implement PCI feedback of uplink closed loop transmit diversity of a terminal configured with only a dedicated channel.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a PCI feedback cell determining method of a terminal only configured with a dedicated channel, which comprises the following steps:
and the network side receives a measurement report reported by a terminal only configured with a dedicated channel, and selects a cell with the maximum chip energy to noise ratio (Ec/No) value and/or the maximum Received Signal Code Power (RSCP) value as a feedback cell of a Precoding Control Indication (PCI) of the terminal when determining that the terminal supports uplink closed loop transmit diversity.
After selecting the feedback cell of the PCI of the terminal, the method further comprises:
and the network side configures the feedback cell of the PCI of the terminal to the terminal through a downlink air interface signaling.
After selecting the feedback cell of the PCI of the terminal, the method further comprises:
and the network side configures the PCI feedback cell of the terminal to a node B (NodeB) of the feedback cell through a wireless link establishment or wireless link reconfiguration message.
The method further comprises the following steps:
when the network side learns that the feedback cell of the PCI of the terminal is No longer the cell with the maximum Ec/No value and/or the maximum RSCP value, the cell with the maximum Ec/No value and/or the maximum RSCP value is selected for the terminal again to serve as the feedback cell of the PCI, and the reselected feedback cell of the PCI is configured to the terminal through a downlink air interface signaling.
The method further comprises the following steps:
and the network side configures the reselected PCI feedback cell to the NodeB of the reselected PCI feedback cell through a wireless link establishment or wireless link reconfiguration message.
The invention also provides a PCI feedback cell determining system of a terminal only configured with a dedicated channel, which comprises: a network side and a terminal configured with only a dedicated channel, wherein,
the terminal only configured with the dedicated channel is used for reporting a measurement report to the network side;
and the network side is configured to receive a measurement report reported by the terminal configured with the dedicated channel only, and select a cell with a largest chip energy to noise ratio (Ec/No) value and/or a largest Received Signal Code Power (RSCP) value as a feedback cell of a Precoding Control Indicator (PCI) of the terminal when determining that the terminal supports uplink closed loop transmit diversity.
The network side is further configured to configure the feedback cell of the PCI of the terminal to the terminal through a downlink air interface signaling after the feedback cell of the PCI of the terminal is selected.
The network side is further configured to, after selecting the feedback cell of the PCI of the terminal, configure the feedback cell of the PCI of the terminal to a node b (nodeb) of the feedback cell through a radio link setup or radio link reconfiguration message.
The network side is further configured to, when it is known that the feedback cell of the PCI of the terminal is No longer the cell with the largest Ec/No value and/or the largest RSCP value, reselect the cell with the largest Ec/No value and/or the largest RSCP value for the terminal as the feedback cell of the PCI, and configure the reselected feedback cell of the PCI to the terminal through a downlink air interface signaling.
The network side is further configured to configure the reselected PCI feedback cell to a NodeB of the reselected PCI feedback cell through a radio link setup or radio link reconfiguration message.
The method and the system for determining the PCI feedback cell of the terminal only provided with the dedicated channel receive the measurement report reported by the terminal only provided with the dedicated channel at the network side, and select the cell with the largest Ec/No value and/or the largest RSCP value as the PCI feedback cell of the terminal when determining that the terminal supports uplink closed loop transmit diversity. The invention realizes the PCI feedback of the uplink closed loop transmit diversity of the terminal only configured with the special channel, so that the terminal only configured with the special channel obtains the optimal PCI feedback cell, thereby improving the system performance.
Drawings
Fig. 1 is a schematic diagram of a channel structure of uplink closed-loop transmit diversity in the prior art;
fig. 2 is a flowchart of a PCI feedback cell determining method according to a first embodiment of the present invention;
fig. 3 is a flowchart of a PCI feedback cell determining method according to a second embodiment of the present invention;
fig. 4 is a flowchart of a method for reconfiguring a PCI feedback cell according to a third embodiment of the present invention;
fig. 5 is a flowchart of a method for reconfiguring a PCI feedback cell according to a fourth embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
The invention provides a PCI feedback cell determining method of a terminal only configured with a dedicated channel, which comprises the following steps: the network side receives a measurement report reported by a terminal only configured with a dedicated channel, and selects a cell with the maximum value of the chip energy to noise ratio (Ec/No) and/or the maximum value of the Received Signal Code Power (RSCP) as a feedback cell of the PCI of the terminal when determining that the terminal supports uplink closed loop transmit diversity.
Further, after selecting the feedback cell of the PCI of the terminal, the network side configures the feedback cell of the PCI of the terminal to the terminal through a downlink air interface signaling.
Further, after selecting the PCI feedback cell of the terminal, the network side configures the PCI feedback cell of the terminal to a node b (nodeb) of the feedback cell through a radio link establishment or radio link reconfiguration message.
Further, when the network side learns that the feedback cell of the PCI of the terminal is No longer the cell with the largest Ec/No value and/or the largest RSCP value, the cell with the largest Ec/No value and/or the largest RSCP value is selected for the terminal again as the feedback cell of the PCI, and the reselected feedback cell of the PCI is configured to the terminal through a downlink air interface signaling. And the network side configures the reselected PCI feedback cell to the NodeB of the reselected PCI feedback cell through a wireless link establishment or wireless link reconfiguration message.
The method for determining the PCI feedback cell of the terminal configured with dedicated channels only according to the present invention is further described in detail with reference to the following embodiments.
As shown in fig. 2, a method for determining a PCI feedback cell according to an embodiment of the present invention mainly includes the following steps:
step 201, the network side issues a measurement control message to a terminal configured with a dedicated channel only.
Taking Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN) as an example, a Radio Network Controller (RNC) on the Network side issues a measurement control message to a terminal configured with a dedicated channel only.
Step 202, the terminal reports the measurement report to the network side.
Step 203, the network side learns that the terminal has the uplink closed loop transmission capability according to the measurement report reported by the terminal, that is, the terminal supports uplink closed loop transmission diversity, so as to select the cell with the largest chip energy to noise ratio (that is, Ec/No value) as the PCI feedback cell of the terminal.
It should be noted that, when receiving a measurement report reported by a terminal, a network side determines whether the terminal has uplink closed-loop transmission capability; the uplink closed loop sending capability of the terminal is predicted by the network side and is not carried by the measurement report.
Step 204, the network side configures the feedback cell of the PCI to the terminal configured with the dedicated channel only through the downlink air interface signaling.
The downlink air interface signaling may be a physical channel reconfiguration message, a radio bearer setup/reconfiguration/release message, and the like, and taking the physical channel reconfiguration message as an example, the physical channel reconfiguration message sent by the network side to the terminal carries information of the feedback cell of the PCI of the terminal.
Step 205, the network side configures the PCI feedback cell of the terminal to the node b (NodeB) of the feedback cell through the radio link setup message or the radio link reconfiguration message, that is, the network side sends the radio link setup message or the radio link reconfiguration message to the NodeB to carry the information of the PCI feedback cell of the terminal.
As shown in fig. 3, the method for determining a PCI feedback cell in the second embodiment of the present invention mainly includes the following steps:
step 301, the network side sends a measurement control message to the terminal configured with dedicated channel only.
Step 302, the terminal reports the measurement report to the network side.
Step 303, the network side learns that the terminal has the uplink closed loop transmission capability according to the measurement report reported by the terminal, that is, the terminal supports uplink closed loop transmission diversity, so as to select the cell with the best working of the received signal chip (i.e., the cell with the largest RSCP value) as the PCI feedback cell of the terminal.
It should be noted that, when receiving a measurement report reported by a terminal, a network side determines whether the terminal has uplink closed-loop transmission capability; the uplink closed loop sending capability of the terminal is predicted by the network side and is not carried by the measurement report.
Step 304, the network side configures the feedback cell of the PCI to the terminal configured with the dedicated channel only through the downlink air interface signaling.
The downlink air interface signaling may be a physical channel reconfiguration message, a radio bearer setup/reconfiguration/release message, and the like, and taking the physical channel reconfiguration message as an example, the physical channel reconfiguration message sent by the network side to the terminal carries information of the feedback cell of the PCI of the terminal.
Step 305, the network side configures the feedback cell of the PCI of the terminal to the NodeB of the feedback cell through a radio link setup message or a radio link reconfiguration message, that is, the network side sends the radio link setup message or the radio link reconfiguration message to the NodeB to carry the information of the feedback cell of the PCI of the terminal.
As shown in fig. 4, the method for reconfiguring a PCI feedback cell in the third embodiment of the present invention mainly includes the following steps:
step 401, the network side issues a measurement control message to a terminal configured with a dedicated channel only.
Step 402, the terminal reports the measurement report to the network side.
Step 403, the network side learns that the feedback cell of the PCI of the terminal is not the cell with the largest Ec/No value according to the measurement report reported by the terminal, so that the cell with the largest Ec/No value is reselected as the feedback cell of the PCI of the terminal.
In step 404, the network side configures the feedback cell of the PCI (i.e. the cell with the largest reselected Ec/No value) to the terminal configured with the dedicated channel only through the downlink air interface signaling.
The downlink air interface signaling may be a physical channel reconfiguration message, a radio bearer setup/reconfiguration/release message, and the like, and taking the physical channel reconfiguration message as an example, the physical channel reconfiguration message sent by the network side to the terminal carries information of a feedback cell (i.e., a cell with the largest reselected Ec/No value) of the PCI of the terminal.
Step 405, the network side configures the feedback cell (i.e. the cell with the largest reselected Ec/No value) of the PCI of the terminal to the NodeB of the feedback cell through a radio link setup message or a radio link reconfiguration message, i.e. the radio link setup message or the radio link reconfiguration message sent to the NodeB by the network side carries the information of the feedback cell (i.e. the cell with the largest reselected Ec/No value) of the PCI of the terminal.
As shown in fig. 5, the method for reconfiguring a PCI feedback cell in the fourth embodiment of the present invention mainly includes the following steps:
step 501, the network side issues a measurement control message to a terminal configured with a dedicated channel only.
Step 502, the terminal reports the measurement report to the network side.
Step 503, the network side learns that the feedback cell of the PCI of the terminal is not the cell with the largest RSCP value according to the measurement report reported by the terminal, so that the cell with the largest RSCP value is reselected as the feedback cell of the PCI of the terminal.
In step 504, the network side configures the feedback cell of the PCI (i.e. the cell with the largest reselected RSCP value) to the terminal configured with the dedicated channel only through downlink air interface signaling.
The downlink air interface signaling may be a physical channel reconfiguration message, a radio bearer setup/reconfiguration/release message, and the like, and taking the physical channel reconfiguration message as an example, the physical channel reconfiguration message sent by the network side to the terminal carries information of a feedback cell of the PCI of the terminal (i.e., a cell with the largest reselected RSCP value).
Step 505, the network side configures the feedback cell (i.e. the cell with the largest reselected RSCP value) of the PCI of the terminal to the NodeB of the feedback cell through the radio link setup message or the radio link reconfiguration message, i.e. the radio link setup message or the radio link reconfiguration message sent to the NodeB by the network side carries the information of the feedback cell (i.e. the cell with the largest reselected RSCP value) of the PCI of the terminal.
The invention also provides a PCI feedback cell determining system of the terminal only configured with the special channel, which comprises: a network side and a terminal only configured with a dedicated channel. Wherein,
only configuring the terminal of the dedicated channel for reporting the measurement report to the network side;
and the network side is used for receiving the measurement report reported by the terminal only configured with the dedicated channel and selecting the cell with the largest Ec/No value and/or the largest RSCP value as the PCI feedback cell of the terminal when determining that the terminal supports uplink closed loop transmit diversity.
Further, after selecting the feedback cell of the PCI of the terminal, the network side configures the feedback cell of the PCI of the terminal to the terminal through a downlink air interface signaling.
Further, after selecting the PCI feedback cell of the terminal, the network side configures the PCI feedback cell of the terminal to the NodeB of the feedback cell through a radio link setup or radio link reconfiguration message.
Further, when the network side knows that the feedback cell of the PCI of the terminal is No longer the cell with the largest Ec/No value and/or the largest RSCP value, the network side reselects the cell with the largest Ec/No value and/or the largest RSCP value for the terminal as the feedback cell of the PCI, and configures the reselected feedback cell of the PCI to the terminal through a downlink air interface signaling. And the network side configures the reselected PCI feedback cell to the NodeB of the reselected PCI feedback cell through a wireless link establishment or wireless link reconfiguration message.
In summary, the present invention realizes PCI feedback of uplink closed loop transmit diversity of a terminal configured with only a dedicated channel, so that the terminal configured with only the dedicated channel obtains an optimal PCI feedback cell, thereby improving system performance.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A PCI feedback cell determining method for a terminal configured with only a dedicated channel, the method comprising:
and the network side receives a measurement report reported by a terminal only configured with a dedicated channel, and selects a cell with the maximum chip energy to noise ratio (Ec/No) value and/or the maximum Received Signal Code Power (RSCP) value as a feedback cell of a Precoding Control Indication (PCI) of the terminal when determining that the terminal supports uplink closed loop transmit diversity.
2. The method for determining the PCI feedback cell of the terminal configured with only dedicated channel according to claim 1, wherein after selecting the feedback cell of the PCI of the terminal, the method further comprises:
and the network side configures the feedback cell of the PCI of the terminal to the terminal through a downlink air interface signaling.
3. The method for determining the PCI feedback cell of the terminal configured with only dedicated channel according to claim 1, wherein after selecting the feedback cell of the PCI of the terminal, the method further comprises:
and the network side configures the PCI feedback cell of the terminal to a node B (NodeB) of the feedback cell through a wireless link establishment or wireless link reconfiguration message.
4. The method for determining the PCI feedback cell of the terminal only configured with the dedicated channel according to claim 1, 2 or 3, wherein the method further comprises:
when the network side learns that the feedback cell of the PCI of the terminal is No longer the cell with the maximum Ec/No value and/or the maximum RSCP value, the cell with the maximum Ec/No value and/or the maximum RSCP value is selected for the terminal again to serve as the feedback cell of the PCI, and the reselected feedback cell of the PCI is configured to the terminal through a downlink air interface signaling.
5. The method for determining the PCI feedback cell of the terminal only configured with the dedicated channel as claimed in claim 4, wherein the method further comprises:
and the network side configures the reselected PCI feedback cell to the NodeB of the reselected PCI feedback cell through a wireless link establishment or wireless link reconfiguration message.
6. A PCI feedback cell determination system for a terminal configured with only a dedicated channel, the system comprising: a network side and a terminal configured with only a dedicated channel, wherein,
the terminal only configured with the dedicated channel is used for reporting a measurement report to the network side;
and the network side is configured to receive a measurement report reported by the terminal configured with the dedicated channel only, and select a cell with a largest chip energy to noise ratio (Ec/No) value and/or a largest Received Signal Code Power (RSCP) value as a feedback cell of a Precoding Control Indicator (PCI) of the terminal when determining that the terminal supports uplink closed loop transmit diversity.
7. The system according to claim 6, wherein the network side is further configured to configure the PCI feedback cell of the terminal to the terminal through a downlink air interface signaling after selecting the PCI feedback cell of the terminal.
8. The system of claim 6, wherein the network side is further configured to configure the PCI feedback cell of the terminal to the node b (nodeb) of the feedback cell through a radio link setup or radio link reconfiguration message after selecting the PCI feedback cell of the terminal.
9. The system according to claim 6, 7, or 8, wherein the network side is further configured to, when it is known that the feedback cell of the PCI of the terminal is No longer the cell with the largest Ec/No value and/or the largest RSCP value, reselect the cell with the largest Ec/No value and/or the largest RSCP value for the terminal as the feedback cell of the PCI, and configure the reselected feedback cell of the PCI to the terminal through a downlink air interface signaling.
10. The system of claim 9, wherein the network side is further configured to configure the reselected PCI feedback cell to the NodeB of the reselected PCI feedback cell through a radio link setup or radio link reconfiguration message.
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| CN201110309610.6A CN103051428B (en) | 2011-10-13 | 2011-10-13 | The only PCI feedback cell determination methods and system of the terminal of configuration dedicated channel |
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