CN101965033B - Global system for mobile communication (GSM) neighbor cell searching method for dual-module terminal and dual-module terminal - Google Patents
Global system for mobile communication (GSM) neighbor cell searching method for dual-module terminal and dual-module terminal Download PDFInfo
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Abstract
The invention relates to the field of communication and discloses a GSM neighbor cell searching method for a dual-module terminal and the dual-module terminal. In the invention, the dual-module terminal of a time division synchronous code division multiple access (TD-SCDMA) mode opens a GSM neighbor cell searching function when the predetermined conditions are met, which means receiving GSM frames continuously in a predetermined frame number and pausing the receiving of TD-SCDMA sub-frames until a frequency correction channel (FCCH) of the GSM is detected; and computing the position of a synchronous channel synchronization channel (SCH) signal in the next frame according to the position of the FCCH signal in the GSM frame, receiving the SCH signal and completing the GSM neighbor cell searching. In the invention, under the condition of guaranteeing small influences on the TD-SCDMA service performance, the TD-SCDMA and GSM radio frequency (RF) receiving is completed by an RF chip, so that a great amount of cost is saved, and power consumption is low.
Description
Technical field
The present invention relates to the communications field, particularly the GSM adjacent area search technique in the communications field.
Background technology
Along with the development of the communication technology, various types of wireless communication systems have been there are, as global system for mobile communications (Global System for Mobile communication, be called for short " GSM "), Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short " WCDMA "), TD SDMA (Time Division Synchronous Code Division MultipleAccess, be called for short " TD-SCDMA "), micro-wave access to global intercommunication (Worldwideinteroperability for Microwave Access, be called for short " WiMAX "), Long Term Evolution (LongTerm Evolution, be called for short " LTE "), bluetooth, China Mobile multimedia broadcasting (China MobileMultimedia Broadcasting, be called for short " CMMB ") etc.
At present, many terminals (as mobile phone) all can be supported two kinds of wireless systems (or wireless standard), as not only supported GSM but also support TD-SCDMA.The terminal of two kinds of wireless systems of this support is commonly referred to dual-mode terminal.About mobile terminal, support the United States Patent (USP) that the technical scheme of multiple wireless system can be 11136547 referring to the patent No..
Because the whole network in TD-SCDMA is synchronous, the alignment of all TD-SCDMA community frame boundaries, and frame number the whole network is unified, and it is synchronous that TD-SCDMA only needs synchronous Shang Yige community to get final product the whole network; ErGSMGe community is asynchronous, and frame boundaries does not overlap, and need carry out frame synchronization to each GSM community.While therefore GSM being done to BSIC VERIFY (identification of base stations code check) under TD-SCDMA, just need do synchronously namely frequency correction channel (FrequencyCorrection Channel to each GSM adjacent area, be called for short " FCCH ") testing process, detecting after FCCH, need further to receive synchronizing channel (SynchronizationChannel is called for short " SCH ").More frequent to the use of RF resource like this.The simplest general method is exactly with two cover radio frequency (Radio Frequency, be called for short " RF ") antenna, TD-SCDMA, GSM is respectively with a path, be independent of each other, after data receiver by digital signal processor (Digital Signal Processor, be called for short " DSP ") Coordination Treatment.As shown in Figure 1, Layer1 (layer 1) physical layer scheduling TD-SCDMA and GSM RF parallel receive, and will receive data buffer storage, and make full use of Layer1 physical layer free time processing bimodulus part, carry out the adjacent area search of GSM.In actual applications, both can select a DSP to realize the processing of TD-SCDMA/GSM bimodulus, and also can divide out and process TD-SCDMA path and GSM path with two DSP.
But, the present inventor finds, adopts the scheme of two RF to carry out the adjacent area search of GSM, BSIC VERIFY (identification of base stations code check) is carried out in GSM adjacent area, although can guarantee that dual mode capability does not affect TD-SCDMA business, can introduce many other technical problems.Such as, be no matter to select a DSP to realize the processing of TD-SCDMA/GSM bimodulus, still adopt two DSP to divide out and process TD-SCDMA path and GSM path, all can increase chip number, all need to eliminate the interference existing between two RF problem that power consumption is larger etc.And, if select a DSP to realize the processing of TD-SCDMA/GSM bimodulus, also can increase RF, Memory (internal memory) dispatches difficulty; If adopt two DSP to divide out, process TD-SCDMA path and GSM path, cost can be higher.
Summary of the invention
The object of the present invention is to provide method and the dual-mode terminal of a kind of dual-mode terminal search GSM adjacent area, GSM adjacent area search under TD-SCDMA pattern can be realized by single RF chip, avoid the phase mutual interference between two RF, cost-saving, reduce power consumption, and less on the impact of TD-SCDMA service feature.
For solving the problems of the technologies described above, embodiments of the present invention provide the method for a kind of dual-mode terminal search GSM adjacent area, comprise following steps:
Dual-mode terminal under TD SDMA TD-SCDMA pattern, when meeting predetermined condition, in predetermined frame number, receive global system for mobile communications GSM frame continuously and suspend the reception to TD-SCDMA subframe, until the frequency correction channel FCCH of GSM detected;
Dual-mode terminal is detecting after FCCH, and the position of synchronous channel SCH signal in lower frame calculated in the position according to FCCH signal in GSM frame;
Dual-mode terminal is the position in lower frame according to the SCH signal calculating, and receives SCH signal, and the reception that recovers TD-SCDMA subframe.
Embodiments of the present invention also provide a kind of dual-mode terminal, comprise:
Judge module, for judging whether the dual-mode terminal under TD SDMA TD-SCDMA pattern meets predetermined condition;
FCCH detection module for judging while meeting predetermined condition at judge module, receives global system for mobile communications GSM frame continuously and suspends the reception to TD-SCDMA subframe, until the frequency correction channel FCCH of GSM detected in predetermined frame number;
Computing module, for detecting after FCCH at FCCH detection module, the position according to FCCH signal in GSM frame, calculates the position of synchronous channel SCH signal in lower frame;
SCH detection module, in the position of lower frame, receives SCH signal for the SCH signal that calculates according to computing module, and the reception that recovers TD-SCDMA subframe.
Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:
Dual-mode terminal under TD-SCDMA pattern is opened the adjacent area function of search of GSM when meeting predetermined condition, in predetermined frame number, continuously receives GSM frame and suspends the reception to TD-SCDMA subframe, until the FCCH of GSM detected.Position according to FCCH signal in GSM frame, calculates the position of synchronous channel SCH signal in lower frame, and receives SCH signal, completes this GSM adjacent area search.Owing to utilizing the timesharing of a RF chip to carry out TD-SCDMA and GSM RF reception, therefore not only avoided the phase mutual interference between two RF, can also reduce significantly chip and use number, save great amount of cost, power consumption is also lower.And, because dual-mode terminal is the adjacent area function of search of just opening GSM when meeting predetermined condition, therefore can be less on the impact of TD-SCDMA service feature by rationally arranging of predetermined condition being guaranteed to the continuous reception of GSM frame.And, because the FCCH of GSM adjacent area detects, be to adopt the method receiving continuously, therefore can within the shortest time, complete FCCH detects, the reception of carrying out immediately again SCH after FCCH detected, shortened as much as possible and suspended the TD-SCDMA frame receiving, and the longlyest can not exceed predetermined frame number, further guaranteed will to be down to minimum on the impact of TD-SCDMA business.
Further, predetermined condition is that the RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area that dual-mode terminal measures meets the community handoff threshold that network side issues, to guarantee that TD-SCDMA signal does not affect TD-SCDMA business when stronger, and TD-SCDMA signal is weak, can carries out in time GSM adjacent area and search net and BSIC VERIFY, to carry out in time bimodulus switching.
Further, dual-mode terminal, when not meeting predetermined condition, utilizes the signal strength signal intensity of the free timeslot measure GSM adjacent regions of TD-SCDMA subframe.Due to the measurement of GSM neighboring area signal intensity, only in TD-SCDMA free timeslot, carry out, do not need to take TD-SCDMA business time-slot, therefore can not impact TD-SCDMA business.
Further, in high speed downlink packet access (HighSpeed Downlink Packet Access is called for short " the HSDPA ") business of dual-mode terminal under TD-SCDMA pattern.Due under HSDPA, TD-SCDMA business time-slot used is more, and free timeslot is few, and the FCCH that only utilizes free timeslot cannot complete GSM adjacent area detects and BSIC VERIFY work, and therefore the present invention is particularly useful for the HSDPA business under TD-SCDMA pattern.
Accompanying drawing explanation
Fig. 1 is according to the dual-mode terminal schematic diagram of the two RF of employing of the prior art;
Fig. 2 is the dual-mode terminal schematic diagram according to first embodiment of the invention;
Fig. 3 is according to the method flow diagram of the dual-mode terminal search GSM adjacent area of first embodiment of the invention;
Fig. 4 is according to the schematic diagram of the GSM adjacent area search in first embodiment of the invention;
Fig. 5 is the dual-mode terminal structural representation according to second embodiment of the invention.
Embodiment
In the following description, in order to make reader understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs and the many variations based on following execution mode and modification, also can realize the each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to the method for a kind of dual-mode terminal search GSM adjacent area.In the present embodiment, adopt the scheme of single RF, single DSP to realize the GSM adjacent area search of dual-mode terminal under TD-SCDMA pattern, as shown in Figure 2.By the scheduling to RF, to open after the function of search of GSM adjacent area, the continuously certain frame number of scheduling receives for GSM, and the FCCH that completes GSM adjacent area detects, and the timesharing that realizes TD-SCDMA and GSM receives.
As shown in Figure 3, in step 301, the dual-mode terminal under TD-SCDMA pattern, judges whether to meet predetermined condition to idiographic flow, if do not meet predetermined condition, does not open the adjacent area function of search of GSM, enters step 302; If meet predetermined condition, open the adjacent area function of search of GSM, enter step 303.
Specifically, predetermined condition in this step is received signal code power (the Received Signal Code Power of the TD-SCDMA Serving cell that measures of dual-mode terminal, be called for short " RSCP ") and the signal strength signal intensity of GSM adjacent area meet the community handoff threshold that network side issues, this community handoff threshold is carried in the E3A message that network side issues.That is to say, dual-mode terminal is under TD-SCDMA pattern time, by the signal strength signal intensity of the RSCP of the TD-SCDMA Serving cell measuring and GSM adjacent area (as the reception signal strength indication RSSI of GSM adjacent area), the handoff threshold in the E3A message issuing with network side compares.The RSCP of TD-SCDMA Serving cell measures and can realize in the prior art, and the signal strength signal intensity of GSM adjacent area also can utilize the free timeslot of TD-SCDMA subframe to measure, and does not repeat them here.
If the signal strength signal intensity of the RSCP of TD-SCDMA Serving cell and GSM adjacent area meets handoff threshold, illustrate that TD-SCDMA signal is weak and GSM signal is stronger, now start the adjacent area function of search of GSM, to guarantee that can carry out in time GSM adjacent area when TD-SCDMA signal is weak searches net, to carry out in time bimodulus switching.If the signal strength signal intensity of the RSCP of TD-SCDMA Serving cell and GSM adjacent area does not meet handoff threshold, illustrate that TD-SCDMA signal is stronger, now do not open the adjacent area function of search of GSM, to guarantee not affect TD-SCDMA business when TD-SCDMA signal is stronger.
In step 302, because the RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area do not meet handoff threshold, therefore dual-mode terminal utilizes the signal strength signal intensity (as the reception signal strength indication RSSI of GSM adjacent area) of the free timeslot measure GSM adjacent regions of TD-SCDMA subframe, does not carry out the adjacent area search of GSM.Due to the measurement of GSM neighboring area signal intensity, only in TD-SCDMA free timeslot, carry out, do not need to take TD-SCDMA business time-slot, therefore can not impact TD-SCDMA business.
In step 303, because the RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area meet handoff threshold, therefore open the adjacent area search to GSM, the reception that recovers TD-SCDMA subframe after GSM searches anastomose bundle.
Specifically, as shown in Figure 4, in predetermined frame number, continuously receive GSM frame and suspend the reception to TD-SCDMA subframe, until the FCCH of GSM detected.That is to say, the continuous GSM frame of dual-mode terminal arrangement receives, and carries out the cycle detection of FCCH.If reach maximum search frame number (in predetermined frame number as 10 frames), do not find yet FCCH, search anastomose bundle; If FCCH detected in maximum frame number, continue next step:
Position according to FCCH signal in GSM frame, calculates the position of SCH signal in lower frame, and is arranged in relevant position reception SCH signal.Separate SCH signal, if cyclic redundancy check (CRC) (CyclicRedundancy Check is called for short " CRC ") success obtains BSIC and frame number, search anastomose bundle; If unsuccessfully, finish equally the network process of searching of this GSM.After searching anastomose bundle, recovers GSM the reception of TD-SCDMA subframe.
Owing to utilizing the timesharing of a RF chip to carry out TD-SCDMA and GSM RF reception, therefore not only avoided the phase mutual interference between two RF, can also reduce significantly chip and use number, save great amount of cost, power consumption is also lower.And because dual-mode terminal is when the RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area meet handoff threshold, the adjacent area function of search of just opening GSM, therefore can guarantee that the continuous reception of GSM frame is less on the impact of TD-SCDMA service feature.And, because the FCCH of GSM adjacent area detects, be to adopt the method receiving continuously, therefore can within the shortest time, complete FCCH detects, the reception of carrying out immediately again SCH after FCCH detected, shortened as much as possible and suspended the TD-SCDMA frame receiving, and the longlyest can not exceed predetermined frame number, further guaranteed will to be down to minimum on the impact of TD-SCDMA business.
In TD-SCDMA/GSM bimodulus injection frequency scheme, TD-SCDMA RF and GSM RF cannot receive simultaneously, need rational management RF to receive for the timesharing of TD-SCDMA and GSM, when TD-SCDMA business time-slot few (being that free timeslot is more), can utilize free timeslot to receive GSM data, carry out the operations such as GSM measurement, and it is more at TD-SCDMA business time-slot used, when free timeslot is few, only utilize free timeslot cannot complete the search of GSM adjacent area, therefore needing to adopt present embodiment to stop TD-SCDMA RF receives and distributes to GSM RF and detect and BSICVERIFY for FCCH, and reduce as much as possible the loss of TD-SCDMA service feature.And under HSDPA, TD-SCDMA business time-slot used is more, free timeslot is few, and therefore present embodiment is particularly useful in the HSDPA business under TD-SCDMA pattern.But it will be understood by those skilled in the art that present embodiment also can be applied in other business under TD-SCDMA pattern.
It should be noted that, method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the memory of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).Equally, memory can be for example programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Second embodiment of the invention relates to a kind of dual-mode terminal.Specifically as shown in Figure 5, this dual-mode terminal comprises:
Measurement module, for measuring the RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area.
Judge module, for judging whether the dual-mode terminal under TD-SCDMA pattern meets predetermined condition.Wherein, predetermined condition is that the RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area that measurement mode measures meets the community handoff threshold that network side issues.This community handoff threshold is carried in the E3A message that network side issues.
FCCH detection module for judging while meeting predetermined condition at judge module, receives GSM frame continuously and suspends the reception to TD-SCDMA subframe, until the FCCH of GSM detected in predetermined frame number.When FCCH detection module does not detect FCCH in predetermined frame number, finish the search of this GSM adjacent area.
Computing module, for detecting after FCCH at FCCH detection module, the position according to FCCH signal in GSM frame, calculates the position of SCH signal in lower frame.
SCH detection module, in the position of lower frame, receives SCH signal for the SCH signal that calculates according to computing module, and the reception that recovers TD-SCDMA subframe.
Wherein, measurement module, when judge module judgement does not meet predetermined condition, utilizes the signal strength signal intensity of the free timeslot measure GSM adjacent regions of TD-SCDMA subframe.
In the present embodiment, in the HSDPA business of dual-mode terminal under TD-SCDMA pattern.
Be not difficult to find, the first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
It should be noted that, each unit of mentioning in the each equipment execution mode of the present invention is all logical block, physically, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, the above-mentioned each equipment execution mode of the present invention is not introduced the unit not too close with solving technical problem relation proposed by the invention, and this does not show that the said equipment execution mode does not exist other unit.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and described, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. a method for dual-mode terminal search GSM adjacent area, is characterized in that, comprises following steps:
Dual-mode terminal under TD SDMA TD-SCDMA pattern, when meeting predetermined condition, in predetermined frame number, receive global system for mobile communications GSM frame continuously and suspend the reception to TD-SCDMA subframe, until the frequency correction channel FCCH of GSM detected;
Described dual-mode terminal is detecting after described FCCH, and the position of synchronous channel SCH signal in lower frame calculated in the position according to FCCH signal in GSM frame;
Described dual-mode terminal is the position in lower frame according to the described SCH signal calculating, and receives described SCH signal, and the reception that recovers described TD-SCDMA subframe;
Wherein, described predetermined condition is that the received signal code power RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area that described dual-mode terminal measures meets the community handoff threshold that network side issues;
Described dual-mode terminal, when not meeting described predetermined condition, utilizes the signal strength signal intensity of the free timeslot measure GSM adjacent regions of TD-SCDMA subframe.
2. the method for dual-mode terminal according to claim 1 search GSM adjacent area, is characterized in that, described community handoff threshold is carried in the E3A message that network side issues.
3. the method for dual-mode terminal search according to claim 1 GSM adjacent area, is characterized in that, also comprises following steps:
If described dual-mode terminal does not detect described FCCH in predetermined frame number, finish the search of this GSM adjacent area.
4. according to the method for the dual-mode terminal search GSM adjacent area described in any one in claims 1 to 3, it is characterized in that, in the high-speed downlink packet access HSDPA business of described dual-mode terminal under TD-SCDMA pattern.
5. a dual-mode terminal, is characterized in that, comprises:
Judge module, for judging whether the dual-mode terminal under TD SDMA TD-SCDMA pattern meets predetermined condition;
Measurement module, for measuring the received signal code power RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area; Described predetermined condition is that the received signal code power RSCP of TD-SCDMA Serving cell and the signal strength signal intensity of GSM adjacent area that described measurement mode measures meets the community handoff threshold that network side issues;
FCCH detection module while meeting predetermined condition for judging at described judge module, receives global system for mobile communications GSM frame continuously and suspends the reception to TD-SCDMA subframe, until the frequency correction channel FCCH of GSM detected in predetermined frame number;
Computing module, for detecting after described FCCH at described FCCH detection module, the position according to FCCH signal in GSM frame, calculates the position of synchronous channel SCH signal in lower frame;
SCH detection module, in the position of lower frame, receives described SCH signal for the described SCH signal that calculates according to described computing module, and the reception that recovers described TD-SCDMA subframe;
Wherein, described measurement module, when described judge module judgement does not meet described predetermined condition, utilizes the signal strength signal intensity of the free timeslot measure GSM adjacent regions of TD-SCDMA subframe.
6. dual-mode terminal according to claim 5, is characterized in that, described community handoff threshold is carried in the E3A message that network side issues.
7. dual-mode terminal according to claim 5, is characterized in that, when described FCCH detection module does not detect described FCCH in predetermined frame number, finishes the search of this GSM adjacent area.
8. according to the dual-mode terminal described in any one in claim 5 to 7, it is characterized in that, in the high-speed downlink packet access HSDPA business of described dual-mode terminal under TD-SCDMA pattern.
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| CN102421131B (en) * | 2011-07-26 | 2014-02-19 | 展讯通信（上海）有限公司 | Mobile terminal, method and device for detecting FCCH (Frequency Correction Channel) frame |
| CN104427593B (en) * | 2013-08-26 | 2018-01-23 | 联想(北京)有限公司 | Communication means and device |
| US9204341B2 (en) * | 2014-03-05 | 2015-12-01 | Apple Inc. | Synchronization beacon detection |
| CN105813173B (en) * | 2014-12-31 | 2020-02-11 | 展讯通信（上海）有限公司 | GSM cell searching method and device of multi-card multi-standby mobile terminal |
| US11678291B2 (en) | 2016-08-21 | 2023-06-13 | Qualcomm Incorporated | Methods and systems for support of location for the Internet of Things |
| US11405863B2 (en) | 2016-10-05 | 2022-08-02 | Qualcomm Incorporated | Systems and methods to enable combined periodic and triggered location of a mobile device |
| US12108305B2 (en) | 2020-09-29 | 2024-10-01 | Qualcomm Incorporated | System and methods for power efficient positioning of a mobile device |
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| CN1281089C (en) * | 2003-10-24 | 2006-10-18 | 中兴通讯股份有限公司 | Decision method for switching between PHS and WCDMA system |
| CN101312575B (en) * | 2007-05-22 | 2011-10-19 | 展讯通信（上海）有限公司 | Method for terminal in TD-SCDMA system to measure GSM neighbor cell |
| US20080298320A1 (en) * | 2007-06-04 | 2008-12-04 | Motorola, Inc. | System to synchronize a gsm device |
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