CN102118816A - Method and system for realizing indoor coverage of wireless signals - Google Patents
Method and system for realizing indoor coverage of wireless signals Download PDFInfo
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Abstract
The invention discloses a method for realizing indoor coverage of wireless signals. The base stations of multiple geographically adjacent or neighboring indoor cells transmit PN (pseudorandom node) signals containing the same pilot PN sequence on a forward pilot channel; and when a mobile station (MS) passes through each indoor cell, the MS processes a pilot activation set according to the intensities of the received PN signals of different paths. The invention also discloses a system for realizing indoor coverage of wireless signals. By adopting the method and system disclosed by the invention, when the MS moves through the cells with the same PN, the MS can always receive the same PN signal from different paths, and the MS switching can not be triggered, thereby effectively improving the system stability resulting from handover drops.
Description
Technical Field
The present invention relates to Code Division Multiple Access (CDMA) wireless communication technologies, and in particular, to a method and system for implementing indoor coverage of wireless signals.
Background
Indoor coverage is one of the most important requirements for CDMA networking, and due to the penetration loss of the building to the wireless signal, the degree of coverage of the indoor environment by the outdoor station is limited, and particularly in large-scale office and commercial buildings, deep coverage is difficult to achieve. In addition, with the continuous development of modern rail transit, a great deal of tunnel facilities appear, the tunnels extend for tens of miles in mountains or are underground with the depth of several meters, and the wireless signals of outdoor base stations in the places can not be covered at all, but a great number of wireless communication users are concentrated in the office commercial buildings and tunnels, so that good indoor coverage is realized, and high-quality coverage, capacity and service quality are provided, which is a basic guarantee for the success of the CDMA wireless communication technology and is a great problem which must be solved by CDMA network building.
Indoor coverage includes coverage of each room in a floor, elevator shaft coverage of high-rise buildings, elevator hall coverage, and the like, and an indoor distributed base station is generally used. Since the indoor environment is divided into many independent small spaces by walls, the radius of the cell performing indoor coverage is generally small. On the other hand, the height and angle of the rf antenna placement in the tunnel are limited, and therefore the cell radius of the wireless cellular system in this case is much smaller than that in the general case.
In a CDMA wireless cellular system, base stations of adjacent cells are distinguished by transmitting differently biased pseudo-random sequence (PN) short codes on a forward pilot channel, i.e.: distinguished by a Pilot pseudo-random sequence offset (Pilot PN offset) or a Pilot pseudo-random sequence (Pilot PN). When a mobile terminal (MS) locked to cell a finds that it receives a weaker PN signal from cell a and a stronger PN signal from a neighboring cell B, the MS considers itself moving from cell a to cell B. The process of the MS leaving cell a and entering cell B triggers a soft handover of the MS, i.e.: the condition for the MS to perform soft handoff is that the two cells traversed by the MS use different PNs.
Based on the above situation, under the prior art, because the cell radius is small and different PNs are configured, when the MS moves back and forth among a plurality of cells, the MS performing a call will be continuously switched, even frequently switched, because the MS receives various PN signals whose strengths are constantly changed. As the number of handovers increases, the MS may drop the call, which eventually increases the call drop rate of the whole cellular communication system, and affects the stability of the system.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and system for implementing wireless signal indoor coverage, which reduces the handover frequency during MS call, thereby improving the stability of the whole cellular communication system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for realizing wireless signal indoor coverage, which comprises the following steps:
base stations of more than one indoor cell adjacent or nearby in geographic position transmit PN signals containing the same PN on a forward pilot channel;
when the MS passes through each indoor cell, processing a pilot frequency activation set according to the strength of received PN signals of different paths;
wherein, the same PN is the same PN short code and PN offset.
In the above solution, before the transmitting PN signals containing the same PN, the method further includes: in the base stations of more than one indoor cell adjacent or neighboring in geographical position, the parameter for generating PN is set to generate the same PN.
In the foregoing solution, the processing of the pilot active set according to the received strengths of the PN signals of different paths specifically includes:
when the MS detects that the strength of a PN signal from an indoor cell is lower than a pilot frequency discarding threshold, the MS removes the PN signal from a pilot frequency active set; when the MS detects that the strength of a PN signal from an indoor cell exceeds a pilot comparison threshold, the PN signal is added into a pilot active set.
In the above scheme, the method further comprises: the base stations of each indoor cell transmit the same synchronization channel signal, paging channel signal and use the same long code mask on the reverse access channel.
The invention provides a system for realizing wireless signal indoor coverage, which comprises: a base station, a MS; wherein,
a base station for generating the same PN and transmitting PN signals containing the same PN on a forward pilot channel;
and the MS is used for processing the pilot frequency active set according to the strength of the received PN signals of different paths when traversing each indoor cell.
In the above solution, the MS is further configured to detect the same PN signal strength from each indoor cell.
In the above solution, the base station is further configured to transmit the same synchronization channel signal and paging channel signal and use the same long code mask in the reverse access channel.
In the above scheme, the processing, by the MS, of the pilot active set according to the received strengths of the PN signals of different paths specifically includes: when the MS detects that the strength of a PN signal originated from an indoor cell is lower than a pilot discarding threshold, the MS removes the PN signal from a pilot active set; and when the MS detects that the strength of the PN signal from one indoor cell exceeds a pilot comparison threshold, adding the PN signal into the pilot active set.
The invention provides a method and a system for realizing wireless signal indoor coverage.A base station of a plurality of indoor cells adjacent or adjacent to the geographical position transmits PN signals containing the same PN on a forward pilot channel; when the MS passes through each indoor cell, the pilot frequency active set is processed according to the strength of the received PN signals of different paths. Therefore, when the MS moves through the cells with the same PN, the MS always receives the same PN signal and only has different paths, and then the MS can consider the pilot signals from different paths of the same cell and further cannot trigger the handover. In this way, the handover frequency of the MS when moving between neighboring or neighboring cells can be greatly reduced, thereby improving the stability of the entire cellular communication system.
Drawings
Fig. 1 is a schematic flow chart of a method for implementing wireless signal indoor coverage according to the present invention;
FIG. 2 is a schematic diagram of wireless signal coverage of a building according to one embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method according to a first embodiment of the present invention;
fig. 4 is a schematic view of the wireless signal coverage of an elevator shaft in a high-rise building according to a second embodiment;
FIG. 5 is a flow chart of a method according to a second embodiment of the present invention;
fig. 6 is a schematic view of the wireless signal coverage of an elevator shaft in a high-rise building according to a third embodiment;
fig. 7 is a flowchart illustrating a method according to a third embodiment of the present invention.
Detailed Description
The basic idea of the invention is: base stations of a plurality of indoor cells adjacent or nearby in geographic position transmit PN signals containing the same PN on a forward pilot channel; when the MS passes through each indoor cell, the pilot frequency active set is processed according to the strength of the received PN signals of different paths, and the switching is not triggered.
Wherein, the same PN is the same PN short code and PN offset.
The invention is further described in detail below with reference to the figures and the specific embodiments.
The method for realizing the indoor coverage of the wireless signals comprises the following steps as shown in figure 1:
step 101: setting generation of the same PN in base stations of a plurality of indoor cells adjacent or neighboring in geographic position;
specifically, in the base stations of a plurality of indoor cells adjacent or neighboring in geographical position, the parameters for generating the PN are set to generate the same PN according to the CDMA system standard such as CDMA 20001 xEV standard, so that the PN signals transmitted by the base stations on the pilot channel are the same.
Step 102: generating the same PN by the base station of each indoor cell, and transmitting the PN signal containing the same PN on the forward pilot channel;
furthermore, the base station of each indoor cell transmits the same synchronous channel signal and paging channel signal and uses the same long code mask in the reverse access channel, so that the signals received by the MS in the coverage area of the base station of each indoor cell are the same, and the problem that the reverse signals transmitted by the MS cannot be demodulated identically at the base station side due to the difference of the synchronous channel signal, the paging channel signal and the long code mask used by the reverse access channel, which affects the transmission and reception of information by the MS is avoided.
Step 103: when the MS passes through each indoor cell, processing a pilot frequency activation set according to the strength of received PN signals of different paths;
specifically, when the MS moves across in each indoor cell, the MS detects the same PN signal strength from each indoor cell, and when the MS detects that the PN signal strength from a certain indoor cell is lower than a pilot discard threshold (T _ DROP), the MS removes the PN signal from the pilot active set; when MS detects that the strength of a PN signal from a certain indoor cell exceeds a pilot comparison threshold (T _ COMP), adding the PN signal into a pilot active set; the T _ DROP and T _ COMP are parameters in the CDMA2000 system in the prior art, and are not described herein again.
In order to implement the method, the invention also provides a system for implementing wireless signal indoor coverage, which comprises: a base station, a MS; setting parameters for generating PN to generate the same PN in advance in base stations of a plurality of indoor cells adjacent or neighboring in geographic position according to the CDMA system standard;
a base station for generating the same PN and transmitting PN signals containing the same PN on a forward pilot channel;
the MS is configured to perform processing on a pilot active set according to strengths of received PN signals of different paths when traversing each indoor cell, and specifically, when the MS detects that the strength of a PN signal originating from one indoor cell is lower than a pilot discard threshold when traversing each indoor cell, the MS removes the PN signal from the pilot active set; when MS detects that the strength of a PN signal from an indoor cell exceeds a pilot comparison threshold, adding the PN signal into a pilot activation set;
the base station is further used for transmitting the same synchronous channel signal and paging channel signal and using the same long code mask in a reverse access channel;
the MS is further configured to detect the same PN signal strength from each indoor cell.
The following detailed description of the implementation and principles of the method of the present invention is provided in connection with specific embodiments.
The first embodiment is as follows:
the method of the present embodiment is applied to wireless signal coverage of a building, wherein indoor cells 1 to n are adjacent or neighboring cells, an indoor cell represents a cell whose coverage is within the building, and an outdoor cell represents a cell whose coverage is outside the building. As shown in fig. 2 and 3, the method comprises the following steps:
step 301: setting and generating the same PN in base stations of indoor cells 1-n;
step 302: base stations of indoor cells 1-n generate the same PN, and transmit PN signals containing the same PN on a front pilot channel;
step 303: MS enters the building from the cell outside the building and carries out the processing of the pilot frequency active set according to the received PN signal strength of different paths when passing through the cell in the building;
specifically, when the MS moves from the outdoor to the entrance of the building, the following steps are performed: when the MS moves to the indoor cell 2 through the outdoor cell, at this time, the MS may receive that the PN signal transmitted by the base station of the outdoor cell on the forward pilot channel is PNout, and may also receive that the PN signal transmitted by the base station of the indoor cell 2 on the forward pilot channel is PNin. The MS is also in an outdoor cell, and detects that the received PNout strength is higher, and the MS keeps the PNout in an active pilot frequency set; meanwhile, the MS detects that the received PNin strength is low and does not reach the T _ COMP threshold, but the MS detects that the received PNin strength is continuously strengthened along with the continuous movement of the mobile MS to the direction of the indoor cell 2.
In the process that the MS enters a building, when the MS enters an indoor cell 2 and the MS detects that the intensity of PNout is lower than a T _ DROP threshold, the MS moves the PNout out of an active pilot frequency set; meanwhile, when the MS detects that PNin exceeds the T _ COMP threshold, the MS adds the PNin into a pilot frequency active set, so that a handover process is completed, and the MS enters an indoor coverage area from an outdoor coverage area.
When the MS moves in the indoor coverage area, the MS determines which cell it is in according to the received signal strength of the forward pilot channel. In the process of moving the MS from the indoor cell 2 to the indoor cell 1, the MS may receive the PNin of the indoor cell 2 and may also receive the PNin of the indoor cell 1. When entering the indoor cell 1, the MS detects that the intensity of PNin from the indoor cell 2 is lower than a T _ DROP threshold, and the MS moves the PNin from the indoor cell 2 out of an active pilot frequency set; meanwhile, when the MS detects that the PNin from the indoor cell 1 exceeds the T _ COMP threshold, the MS adds the PNin from the indoor cell 1 into a pilot frequency activation set; and so on, the MS can traverse any cell in the building.
In this embodiment, since the PN signals transmitted by all base stations of the indoor cells 1 to n on the pilot channel are PNin, and only the paths are different, the MS does not switch when the indoor cells pass through.
Example two:
the elevator shaft in high-rise buildings is difficult to cover indoors all the time, and the modern high-rise buildings move for dozens of floors or even hundreds of floors, and the high-speed elevators which come from the beginning shuttle among floors at high speed. As shown in fig. 4, the cells 1 to n are cells covering adjacent elevator shafts on floors, but the cells are completely different, that is, the forward pilot channel signals of the cells are different, which results in that an ascending elevator or a descending elevator passes through the cells covered by the floors independently at a high speed, the mobile MS in the elevator at the position frequently switches during passing through a plurality of cells at a high speed, and meanwhile, due to the abrupt change of the coverage signals of the cells received by the mobile MS, a call drop is easily generated, which greatly affects the use experience of users.
The method of the embodiment is applied to the wireless signal coverage of the elevator shaft in the high-rise building, and as shown in fig. 5, comprises the following steps:
step 501: setting and generating the same PN in the base stations of the cells 1-n;
step 502: base stations of cells 1-n generate the same PN, and PN signals containing the same PN are transmitted on a front pilot channel and are all PN 0;
step 503: when the MS passes through each cell through the elevator, processing a pilot frequency active set according to the strength of received PN0 signals of different paths;
specifically, when the MS moves to the cell 2 through the elevator via the cell 1, the MS can receive that the PN signal transmitted by the base station of the cell 1 on the forward pilot channel is PN0, and can also receive that the PN signal transmitted by the base station of the cell 2 on the forward pilot channel is PN 0. Since the MS is also in cell 1, detecting that the received PN0 strength of cell 1 is greater, the MS retains the PN0 of cell 1 in the active pilot set; meanwhile, the MS detects that the strength of the PN0 received by the cell 2 is low and does not reach the T _ COMP threshold, but the MS detects that the strength of the PN0 received by the cell 2 is increasing as the mobile MS moves in the direction of the cell 2.
When the MS enters the cell 2 and detects that the strength of the PN0 of the cell 1 is lower than the T _ DROP threshold, the MS moves the PN0 of the cell 1 out of the active pilot set; meanwhile, when the MS detects that the strength of the PN0 of the cell 2 exceeds a T _ COMP threshold, the MS adds the PN0 of the cell 2 into a pilot frequency active set; and so on, the MS can pass through any cell in the building through the elevator.
In this embodiment, since the PN signals transmitted by all base stations of the cell 1 to the cell n on the forward pilot channel are PN0, and only the paths are different, the MS will not be switched when traveling through these indoor cells by taking an elevator.
Example three:
fig. 6 shows another conventional method for covering a high-rise elevator shaft, in which a single cell is used to cover the inside of the shaft, and the outside of the shaft is covered by floor cells. The method also has obvious defect that when the mobile MS enters the elevator in the call keeping process, the PN signal of the cell in the elevator well is suddenly enhanced at the moment when the elevator door is opened, and the pilot signal of the cell outside the elevator is suddenly reduced to be weak at the moment when the elevator door is closed, so that the call of the mobile MS is easily dropped due to the switching of the cell signal under the strong and weak changing condition. Similarly, when the MS in the call leaves the elevator at the moment, when the elevator door is suddenly opened, the pilot signal of the cell outside the door is suddenly increased to be very strong, and when the elevator door is closed, the PN signal of the cell in the elevator shaft received by the MS is suddenly weakened, so that the switching of the cell signal under the condition of a strong or weak change can easily cause the mobile MS to drop the call.
In this embodiment, the method for realizing wireless signal coverage of the elevator shaft in the high-rise building, as shown in fig. 7, includes the following steps:
step 701: setting and generating the same PN in base stations of indoor cells 1-n and an elevator cell m;
step 702: base stations of indoor cells 1-n and elevator cell m generate the same PN, and PN signals containing the same PN are transmitted on a front pilot channel and are all PN 0;
step 703: when the MS passes through the elevator cell m and each indoor cell, processing a pilot frequency activation set according to the strength of received PN0 signals of different paths;
specifically, when the MS moves from the elevator cell m to the indoor cell 1, and the elevator door is closed, the PN signal transmitted by the base station of the elevator cell m on the forward pilot channel received by the MS is PN0, and since the MS detects that the received PN0 of the elevator cell m has high strength, the MS retains the PN0 of the elevator cell m in the active pilot set.
When the elevator door is opened, the MS suddenly receives the PN0 of the indoor cell 1, and when the received PN0 strength of the indoor cell 1 exceeds the T _ COMP threshold, the MS adds the PN0 of the indoor cell 1 into a pilot frequency activation set; when the MS leaves elevator cell m and enters indoor cell 1, the MS removes the pilot active set from PN0 of elevator cell m when detecting that the received PN0 strength of elevator cell m is below the T _ DROP threshold. At this time, the MS only senses the change of the PN0 signal path, and the handover does not occur; and so on, the MS can pass through any cell in the building through the elevator.
In this embodiment, since the PN signals transmitted by all base stations of the indoor cells 1 to n and the elevator cell m on the forward pilot channel are PN0, and only the paths are different, the MS does not switch when riding in the elevator and passing through these indoor cells.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (8)
1. A method for implementing indoor coverage of a wireless signal, the method comprising:
base stations of more than one indoor cell adjacent or near to the geographical position transmit PN signals containing the same pilot pseudo-random sequence (PN) on a forward pilot channel;
when a mobile terminal (MS) passes through each indoor cell, processing a pilot frequency active set according to the strength of received PN signals of different paths;
wherein, the same PN is the same PN short code and PN offset.
2. The method of claim 1, wherein prior to said transmitting the PN signals containing the same PN, the method further comprises: in the base stations of more than one indoor cell adjacent or neighboring in geographical position, the parameter for generating PN is set to generate the same PN.
3. The method according to claim 1, wherein the processing of the pilot active set according to the received strengths of the PN signals of different paths specifically comprises:
when the MS detects that the strength of a PN signal from an indoor cell is lower than a pilot frequency discarding threshold, the MS removes the PN signal from a pilot frequency active set; when the MS detects that the strength of a PN signal from an indoor cell exceeds a pilot comparison threshold, the PN signal is added into a pilot active set.
4. A method according to any one of claims 1 to 3, characterized in that the method further comprises: the base stations of each indoor cell transmit the same synchronization channel signal, paging channel signal and use the same long code mask on the reverse access channel.
5. A system for implementing indoor coverage of wireless signals, the system comprising: a base station, a MS; wherein,
a base station for generating the same PN and transmitting PN signals containing the same PN on a forward pilot channel;
and the MS is used for processing the pilot frequency active set according to the strength of the received PN signals of different paths when traversing each indoor cell.
6. The system of claim 5, wherein the MS is further configured to detect the same PN signal strength from each indoor cell.
7. The system of claim 5 or 6, wherein the base station is further configured to transmit the same synchronization channel signal, paging channel signal, and use the same long code mask on the reverse access channel.
8. The system according to claim 5, wherein the processing of the pilot active set by the MS according to the received strengths of the PN signals of different paths specifically comprises: when the MS detects that the strength of a PN signal originated from an indoor cell is lower than a pilot discarding threshold, the MS removes the PN signal from a pilot active set; and when the MS detects that the strength of the PN signal from one indoor cell exceeds a pilot comparison threshold, adding the PN signal into the pilot active set.
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| CN2009102175207A CN102118816A (en) | 2009-12-31 | 2009-12-31 | Method and system for realizing indoor coverage of wireless signals |
| PCT/CN2010/074640 WO2010149086A1 (en) | 2009-12-31 | 2010-06-28 | Method and system for enabling wireless signal indoor coverage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108684020A (en) * | 2015-01-23 | 2018-10-19 | 华为技术有限公司 | A kind of paging method, equipment and system |
| CN112437446A (en) * | 2020-11-09 | 2021-03-02 | 中国联合网络通信集团有限公司 | Method and device for distinguishing multi-layer cell division cells, electronic equipment and storage medium |
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| US20020061751A1 (en) * | 2000-05-19 | 2002-05-23 | Huawei Technologies Co., Ltd. | Soft handover method for CDMA mobile communication system |
| CN101478799A (en) * | 2009-02-05 | 2009-07-08 | 中兴通讯股份有限公司 | Signal coverage method, CDMA access wireless cellular communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101212809B (en) * | 2006-12-29 | 2012-11-14 | 朗迅科技公司 | Method for handling coverage in radio communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1268277A (en) * | 1997-06-24 | 2000-09-27 | 艾利森电话股份有限公司 | Sectorization of cellular CDMA-system |
| US20020061751A1 (en) * | 2000-05-19 | 2002-05-23 | Huawei Technologies Co., Ltd. | Soft handover method for CDMA mobile communication system |
| CN101478799A (en) * | 2009-02-05 | 2009-07-08 | 中兴通讯股份有限公司 | Signal coverage method, CDMA access wireless cellular communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108684020A (en) * | 2015-01-23 | 2018-10-19 | 华为技术有限公司 | A kind of paging method, equipment and system |
| US10813076B2 (en) | 2015-01-23 | 2020-10-20 | Huawei Technologies Co., Ltd. | Paging method, device, and paging system |
| US10999818B2 (en) | 2015-01-23 | 2021-05-04 | Huawei Technologies Co., Ltd. | Paging method, device, and paging system |
| CN112437446A (en) * | 2020-11-09 | 2021-03-02 | 中国联合网络通信集团有限公司 | Method and device for distinguishing multi-layer cell division cells, electronic equipment and storage medium |
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Application publication date: 20110706 |