CN101415202A - Method and apparatus for implementing high speed business measurement between systems - Google Patents
Method and apparatus for implementing high speed business measurement between systems Download PDFInfo
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Abstract
The invention provides a method for realizing measurement among systems under a high-speed service. The method comprises the following steps: receiving effective data sent within continuous idle time windows are received; performing leading zero padding and tailing zero padding on the received effective data; performing sliding synchronous burst detection on the data padded with zero by using training sequence codes, and detecting a base station identification code after obtaining the complete synchronous burst effective data. The invention further provides a device for realizing the measurement among the systems under the high-speed service. By the method and the device, BSIC detection of neighbor cells is carried out by the idle time widows consisting of special time slots, which causes the terminal to realize neighbor cell measurement among the systems to further complete the switching among the systems when available conventional idle time windows do not exist within a service time slot under the high-speed service.
Description
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a method and an apparatus for implementing inter-system measurement under high speed service.
Background
In a mobile communication system, for a single-antenna multimode terminal, in a connection mode, all configured neighboring cells need to be periodically measured according to protocol requirements, so as to implement service switching between cells of different cells or different access technologies. Meanwhile, for a system without a compression mode, under certain high-speed service conditions, an idle time window for neighbor cell measurement is very small, and neighbor cell measurement in the system can only be completed generally, so that it is difficult to periodically measure neighbor cells of different systems according to protocol requirements, that is, service switching between systems cannot be completed under such conditions. For example, in TD-SCDMA system, if the terminal is performing High Speed service, such as HSDPA (High Speed Downlink packet access) service of 2.8Mbps or UL (Uplink) 384kbps/DL (Downlink) service, only TS0, DwPTS (Downlink Pilot Timeslot), GAP (guard slot), and UpPTS (Uplink Pilot Timeslot) are currently left for inter-cell measurement, but these 4 timeslots are only 950us in total, and the minimum requirement for idle time window for GSM cell BSIC (base station Identity Code) detection is 950us, so that synchronous detection between GSM cells cannot be performed, and at most, RSSI (Received Signal Strength Indicator) detection cannot be performed for GSM.
Certainly, in the prior art, a multi-antenna terminal can be used for processing high-speed data services, but the multi-antenna terminal has high cost, high requirements on a digital baseband processor, and high power consumption, and is not beneficial to improving the working efficiency and saving the cost.
However, in addition to the multi-antenna terminal, there are two methods for solving the above problem: firstly, measurement between systems is not carried out, and an idle time window is only used for adjacent cell measurement in the system, namely, the adjacent cell measurement result of the different system is not reported or the lowest measurement value is not reported; the other is to measure only RSSI without making cell synchronization measurements. However, both methods cannot or cannot effectively perform inter-system neighbor measurement, so that inter-system handover of services under such a condition cannot be realized, and the service quality of high-speed data services is greatly affected under the condition that the current 3G network coverage is not complete.
Disclosure of Invention
In view of this, the problem to be solved by the present invention is to provide a method and an apparatus for implementing inter-system measurement under high speed service, so that when there is no available conventional idle time window in a service timeslot under high speed service, a terminal can implement inter-system neighbor measurement to complete inter-system handover.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a method for implementing inter-system measurement under high speed service includes:
receiving effective data sent in a continuous idle time window;
carrying out front and back zero padding processing on the received effective data;
and carrying out sliding synchronous burst detection on the data after zero padding by using the training sequence code, and detecting the base station identification code after acquiring complete synchronous burst effective data.
Correspondingly, the method further comprises the following steps:
the idle time window is composed of TS0, downlink pilot time slot, guard time slot and uplink pilot time slot.
Correspondingly, the zero padding processing further comprises:
0 bits are padded before and after the valid data according to the synchronization burst bit length.
Correspondingly, the method further comprises the following steps:
finding out the position of the first effective bit of the synchronous burst data after zero padding according to the position of the training sequence bit;
and determining complete synchronization burst valid data from the synchronization burst data according to the position of the first valid bit.
Correspondingly, before receiving the data, the method further comprises the following steps:
searching whether a conventional idle time window exists currently, if so, configuring the idle window into inter-system neighbor measurement, otherwise, configuring the idle window into the inter-system neighbor measurement
And judging whether the current special time slot is idle, and if so, configuring the special time slot as a whole to be measured in the adjacent region of the different system.
An apparatus for implementing inter-system measurement under high speed service, the apparatus comprising: the device comprises a receiving unit, a zero padding unit and a detection unit; wherein,
the receiving unit is used for receiving the effective data sent in the continuous idle time window;
the zero padding unit is used for carrying out front and back zero padding processing on the effective data received by the receiving unit;
the detection unit is used for performing sliding synchronous burst detection on the data subjected to zero padding by the zero padding unit by using the local training sequence code, and detecting the base station identification code after acquiring complete synchronous burst effective data.
Correspondingly, the zero padding unit further comprises:
and a padding unit for padding 0 bits before and after the valid data according to the bit length of the synchronization burst data.
Correspondingly, the detection unit further comprises:
the searching unit is used for finding the position of the first effective bit of the synchronous burst data after zero padding by the zero padding unit according to the position of the training sequence bit;
and the determining unit is used for determining the complete synchronization burst valid data from the synchronization burst data according to the position of the first valid bit.
Correspondingly, the device also comprises: a search unit and a judgment unit;
the searching unit is used for searching whether a conventional idle time window exists at present, if so, the idle window is configured to be measured by an inter-system neighbor cell, otherwise, the judging unit is informed;
the judging unit is used for judging whether the current special time slot is idle when no conventional idle time window exists, and if so, the special time slot is configured as the inter-system adjacent area measurement as a whole.
It can be seen that, by adopting the method and the device of the present invention, the BSIC detection of the neighboring cells is performed by using the idle time window composed of the special time slots, so that the terminal can perform the inter-system neighboring cell measurement and then complete the inter-system handover when there is no available conventional idle time window in the service time slot under the high-speed service.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of a structure of a synchronization burst;
FIGS. 3A, 3B, and 3C are schematic diagrams illustrating the relationship between the synchronization burst data to be measured and the idle time window;
fig. 4 is a schematic view of the apparatus of the present invention.
Detailed Description
The basic idea of the invention is to use the idle time window composed of special time slots to detect the base station identification code, and further to complete the measurement of the adjacent interval of the different systems, thereby solving the problem that the inter-system measurement can not be carried out under the condition of high-speed service.
To this end, the present invention provides a method for implementing inter-system measurement under high speed service, as shown in fig. 1, the method includes:
step 101: receiving effective data sent in a continuous idle time window;
step 102: carrying out front and back zero padding processing on the received effective data;
step 103: and carrying out sliding synchronous burst detection on the data after zero padding by using the training sequence code, and detecting the base station identification code after acquiring complete synchronous burst effective data.
In order to make the present invention better understood by those skilled in the art, the method of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments, taking TD and GSM as examples:
those skilled in the art understand that in the connected mode, the terminal may continuously try BSIC detection through the idle window, for TD-SCDMA and GSM two different systems, due to different frame structures and frame lengths, the deviation of the frame boundary between two adjacent times may change 5/13ms to 385us (refer to TS25.225, i.e. 5ms (TDD subframe) -60/13(GSM frame) ═ 5/13us), in order to ensure that GSM BSIC is necessarily captured in the idle window, the minimum requirement for the idle window width is (577us +385us) 962us (where 577us is a TDMA slot length, i.e. 60/13/8ms), the maximum time for the terminal to capture a GSM cell BSIC in the specific idle window is approximately 60/13 x 13 to 660ms (refer to TS25.225, i.e. the minimum common multiple of frame boundary alignment of two systems and the maximum period of occurrence of BSIC is 11 TDMA frames), during this time, the SCH (synchronization Channel) slot will only appear once in the idle window, and considering the complexity of the wireless environment, if deep fading occurs at this time, the acquisition time will be a plurality of 660ms periods.
Therefore, as described above, under some high-speed services, there is no available idle service timeslot window, and in order to support inter-system service measurement and handover, TS0 and 3 consecutive special timeslots DwPTS, GAP and UpPTS may be used for measurement, that is, the idle time window composed of these 4 timeslots is used for BSIC detection; the specific implementation steps are as described in example 1 below:
configuring a GSM receiving frequency in a time slot before an idle time window, starting to receive the 950us GSM data of 4 time slots at the boundary of the idle time window, and then carrying out zero padding processing on the 950us data;
specifically, the burst type carrying BSIC in the GSM system is a Synchronization Burst (SB), and its structure is as shown in fig. 2: wherein,
BN 0-BN 2, BN 145-BN 147: fixing all 0 tail bits;
BN 3-BN 41, BN 106-BN 144: information bits, which are BSIC encoded data;
BN 42-BN 105: a training sequence with a fixed length of 64 bits is used for channel estimation;
BN148 to BN 156: a guard period bit;
BN: bit Number;
as can be seen from fig. 2, only the information bits and the training sequence in the SB are actually valid bits, and if the front and rear tail bits are considered to be received, the valid data time length of one SB is about (3+39+64+39+3)/270.83 ═ 547us, that is, the length after 8.25 guard bits are removed; thus, the minimum idle time window length required for detecting the BSIC becomes 931us, i.e., the length of the idle time window after 8.25 bits are removed; meanwhile, since the tail bits are all fixed 0 bits after modulation, the tail bits are not received, but 0 bits are fixedly filled in corresponding positions before equalization, so that the demodulation performance is basically unaffected by the method, and further description is omitted; therefore, the leading redundancy time is about 11us, the subsequent redundancy time is about 42us, and the minimum idle time window length is further shortened to 920 us;
the valid data in the receiving window is reserved, then 3bits of zero data are added in the front, 8.25+ 3-11.25 bits of zero data are added in the tail, and thus data with the total length of (950 × 270.83+14.25) -272 bits, such as numbers of BN 0-BN 271, are obtained; of these, 14.25 is data with local zero padding.
Carrying out sliding correlation SB detection on the data by utilizing a local TSC sequence;
determining the position of the first valid bit of the SB according to the TSC position in the SB, wherein the SB is available for BSIC detection if the position of the first valid bit is within the range of (BN0, BN 115); then, taking out a complete SB data (157 bits) from 272 bits according to the first bit position, and then carrying out BSIC detection on the demodulated data; specifically, fig. 3 shows a relation between synchronization burst data to be measured and an idle time window;
in fig. 3, T is tail bits, D is data bits, TSC is a training sequence, G is a guard interval, and Tsync is GSM receiver settling time; for example, when the TS6 adjacent to the idle window is TDD reception, the two receivers simultaneously operate in the TS6 time slot without affecting each other, i.e., Tsync is 0 us; when TS1 is a transmission time slot, the transmitter power is generally high, and at this time, the previous GSM reception time slot is affected, i.e., Tsync is not 0, and the settling time of the receiver power amplifier is about 8us, so that the length of the whole idle time window is only about 940us actually; FIGS. 3A, 3B show the case where the SB valid data happens to fall on the boundary of the idle window, where, except for the data to be processed, the idle window still has (425-Tsync) us, which is still greater than the aforementioned two-system frame timing offset value 385us, i.e., within 660ms, and FIG. 3C shows the general case where the complete SB falls within the idle window; therefore, it is known that BSIC detection can be performed on data by inevitably generating a BSIC detectable SB once in the time window.
In addition, in the embodiment of the present invention, before receiving valid data, whether a conventional idle time window exists at present may be searched, and if the conventional idle time window exists, the idle time window is configured as inter-system neighbor measurement; otherwise, judging whether the current special time slot is idle, and if so, configuring the special time slot as a whole to be adjacent measurement of the different system; therefore, the method is also suitable for the neighbor measurement under low-speed service and the standby measurement under the standby state.
It can be seen that, by adopting the method of the present invention, when there is no available conventional idle time window in the service time slot under the high-speed service, the terminal can realize the inter-system neighbor cell measurement and then complete the inter-system handover.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware associated with program instructions, and the program is stored in a specific storage medium.
Based on the above idea, the present invention further provides an apparatus for implementing inter-system measurement under high speed service, as shown in fig. 4, the apparatus includes: a receiving unit 401, a zero padding unit 402 and a detecting unit 403; wherein,
the receiving unit 401 is configured to receive valid data sent in a continuous idle time window;
the zero padding unit 402 is configured to perform front and back zero padding processing on the valid data received by the receiving unit 401;
specifically, the receiving unit 401 configures a GSM receiving frequency in a time slot before an idle time window, and starts to receive GSM data of 950us in total from 4 time slots at a boundary of the idle time window, and then the zero padding unit 402 performs zero padding on the data of 950 us;
the zero padding unit may further include a padding unit, configured to pad 0 bits before and after the valid data according to the bit length of the synchronous burst data, that is, retain the valid data in the receiving window, add 3bits of zero data before the valid data, and add 8.25+3 to 11.25bits of zero data at the tail of the valid data;
the detection unit 403 is configured to perform sliding synchronous burst detection on the data after zero padding by the zero padding unit by using a local training sequence code, and perform detection on the base station identifier after obtaining complete synchronous burst valid data;
specifically, the detecting unit 403 performs sliding correlation SB detection on the data by using a local TSC sequence; in addition, the detection unit may further include:
the searching unit is used for finding the position of the first effective bit of the synchronous burst data after zero padding by the zero padding unit according to the position of the training sequence bit; that is, the position of the first valid bit of the SB is determined according to the TSC position in the SB, and if the position of the first valid bit is within the range of (BN0, BN115), the SB is available for BSIC detection;
a determining unit, configured to determine complete synchronization burst valid data from the synchronization burst data according to a position of a first valid bit; that is, one complete SB data (i.e., 157bits) is extracted from 272 bits according to the first bit position, and then BSIC detection is performed on the demodulated data.
In addition, the apparatus may further include a search unit and a judgment unit;
the searching unit is used for searching whether a conventional idle time window exists at present, if so, the idle window is configured to be measured by an inter-system neighbor cell, otherwise, the judging unit is informed; the judging unit is used for judging whether the current special time slot is idle when no conventional idle time window exists, and if so, the special time slot is configured as the inter-system adjacent area measurement as a whole; therefore, the method is also suitable for the neighbor measurement under low-speed service and the standby measurement under the standby state.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for implementing inter-system measurement under high speed service, the method comprising:
receiving effective data sent in a continuous idle time window;
carrying out front and back zero padding processing on the received effective data;
and carrying out sliding synchronous burst detection on the data after zero padding by using the training sequence code, and detecting the base station identification code after acquiring complete synchronous burst effective data.
2. The method of claim 1, further comprising:
the idle time window is composed of TS0, downlink pilot time slot, guard time slot and uplink pilot time slot.
3. The method of claim 2, wherein the zero padding process further comprises:
0 bits are padded before and after the valid data according to the synchronization burst bit length.
4. The method of claim 3, further comprising:
finding out the position of the first effective bit of the synchronous burst data after zero padding according to the position of the training sequence bit;
and determining complete synchronization burst valid data from the synchronization burst data according to the position of the first valid bit.
5. The method of any one of claims 1 to 4, further comprising, prior to receiving the data:
searching whether a conventional idle time window exists currently, if so, configuring the idle window into inter-system neighbor measurement, otherwise, configuring the idle window into the inter-system neighbor measurement
And judging whether the current special time slot is idle, and if so, configuring the special time slot as a whole to be measured in the adjacent region of the different system.
6. An apparatus for performing inter-system measurements in high speed traffic, the apparatus comprising: the device comprises a receiving unit, a zero padding unit and a detection unit; wherein,
the receiving unit is used for receiving the effective data sent in the continuous idle time window;
the zero padding unit is used for carrying out front and back zero padding processing on the effective data received by the receiving unit;
the detection unit is used for performing sliding synchronous burst detection on the data subjected to zero padding by the zero padding unit by using the local training sequence code, and detecting the base station identification code after acquiring complete synchronous burst effective data.
7. The apparatus of claim 6, wherein the zero padding unit further comprises:
and a padding unit for padding 0 bits before and after the valid data according to the bit length of the synchronization burst data.
8. The apparatus of claim 7, wherein the detection unit further comprises:
the searching unit is used for finding the position of the first effective bit of the synchronous burst data after zero padding by the zero padding unit according to the position of the training sequence bit;
and the determining unit is used for determining the complete synchronization burst valid data from the synchronization burst data according to the position of the first valid bit.
9. The apparatus of any one of claims 6 to 8, further comprising: a search unit and a judgment unit;
the searching unit is used for searching whether a conventional idle time window exists at present, if so, the idle window is configured to be measured by an inter-system neighbor cell, otherwise, the judging unit is informed;
the judging unit is used for judging whether the current special time slot is idle when no conventional idle time window exists, and if so, the special time slot is configured as the inter-system adjacent area measurement as a whole.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101888267A (en) * | 2010-04-14 | 2010-11-17 | 东方通信股份有限公司 | Base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technique and signal processing method thereof |
| CN101997567B (en) * | 2009-08-21 | 2013-03-06 | 联芯科技有限公司 | Method and device for identifying base station identify code |
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| CN1516491A (en) * | 2003-01-06 | 2004-07-28 | 西门子（中国）有限公司 | Measurement method between frequencies and between system for making system synchronization in mobile communication system |
| CN100586049C (en) * | 2003-05-13 | 2010-01-27 | 诺基亚西门子通信系统技术（北京）有限公司 | Method of enlarging measurement window in TDMA mobile communication system |
| GB2421406B8 (en) * | 2004-12-17 | 2007-05-10 | Chung Shan Inst Of Science | Apparatus and method for defining symbol timing window and capturing signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997567B (en) * | 2009-08-21 | 2013-03-06 | 联芯科技有限公司 | Method and device for identifying base station identify code |
| CN101888267A (en) * | 2010-04-14 | 2010-11-17 | 东方通信股份有限公司 | Base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technique and signal processing method thereof |
| CN101888267B (en) * | 2010-04-14 | 2013-11-06 | 东方通信股份有限公司 | Base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technique and signal processing method thereof |
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