CN111356235B - PDT and LTE frequency distribution method under wide-narrow fusion system - Google Patents
PDT and LTE frequency distribution method under wide-narrow fusion system Download PDFInfo
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- CN111356235B CN111356235B CN201811579794.6A CN201811579794A CN111356235B CN 111356235 B CN111356235 B CN 111356235B CN 201811579794 A CN201811579794 A CN 201811579794A CN 111356235 B CN111356235 B CN 111356235B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a frequency distribution method of PDT and LTE under a wide-narrow fusion system, which comprises the following steps: dividing uplink 351-356 MHz and downlink 361-365 MHz into 3 sections respectively, wherein the second section of frequency is LTE special bandwidth and is distributed to an LTE system; the uplink first section frequency and the uplink third section frequency are PDT/LTE shared bandwidth and are shared by a PDT system and an LTE system; downstream first and third segment frequencies are assigned to the PDT system; the LTE system establishes an FDD cell with asymmetric bandwidth, wherein the uplink is established at 351-356 MHz, and the downlink is established at the second-stage frequency; and performing corresponding resource allocation according to the result of the resource division. By applying the technical scheme disclosed by the application, the uplink resource utilization rate of PDT/LTE can be maximized.
Description
Technical Field
The application relates to the technical field of communication, in particular to a frequency allocation method for PDT and LTE in a wide-narrow integrated system.
Background
With the continuous development of wireless communication technology, trunking communication technology develops from an analog system to a narrowband digital trunking system, and with the increasing demand of industrial users on wireless broadband, the trunking communication technology develops from a simple voice service to a digital trunking communication system represented by eLTE.
In the wireless communication technology, the most important and fundamental is wireless spectrum resources, most of the spectrum resources below 1GHz are already allocated to the narrowband system, it is difficult to allocate a wider section of spectrum resources suitable for LTE exclusive use, and the existing spectrum allocation in china is shown in fig. 1.
China public security has already preliminarily established a digital trunking (PDT) network for police in the national public security field at present, and supports voice point call, voice trunking and data services with small data volume. However, with the development of the society, on the basis of the voice trunking communication and the security mechanism, the broadband private network requirements for supporting multimedia fusion services such as pictures, videos, real-time positioning and the like and commanding and scheduling are more and more urgent, and the narrow-band communication system cannot meet the existing service requirements, so that the existing PDT/TETRA is analyzing and introducing a broadband evolution scheme at present.
The frequency spectrum of the cluster PDT system currently used by the public security in china is shown in fig. 2. Wherein, 351-356 MHz is used for PDT ascending, and 361-366 MHz is used for PDT descending.
Under the condition that no newly allocated LTE broadband private network frequency spectrum exists, a technical scheme of frequency replanning by using the existing 2x5MHz FDD frequency spectrum dedicated for public security at 351-356 MHz (UL)/361-366 MHz (DL) is adopted, wherein a part of the frequency spectrum is allocated in the 2x5MHz bandwidth to be used by a PDT system, and a part of the frequency band is allocated to be used by an LTE system, as shown in FIG. 3. The PDT system comprises 351-353 MHz used for PDT uplink, 353-356 MHz used for LTE uplink, 361-363 MHz used for PDT downlink and 363-366 MHz used for LTE downlink.
As can be seen from fig. 3, in the prior art, only a part of bandwidth is freed from PDT for use by LTE through frequency re-planning, but PDT and LTE systems do not implement dynamic resource sharing, and during the time when PDT spectrum resources are idle, idle resources cannot be dynamically scheduled and reused for LTE systems, and resource utilization maximization cannot be achieved.
Disclosure of Invention
The application provides a frequency allocation method of PDT and LTE under a wide-narrow fusion system, so as to maximize the utilization rate of uplink resources of PDT/LTE.
The application discloses a frequency distribution method of PDT and LTE under a wide-narrow fusion system, which comprises the following steps:
dividing uplink 351-356 MHz and downlink 361-365 MHz into 3 sections respectively, wherein the second section of frequency is LTE special bandwidth and is allocated to an LTE system; the uplink first section frequency and the uplink third section frequency are PDT/LTE shared bandwidth and are shared by a PDT system and an LTE system; downstream first and third segment frequencies are assigned to the PDT system;
the LTE system establishes an FDD cell with asymmetric bandwidth, wherein the uplink is established at 351-356 MHz, and the downlink is established at the second-stage frequency;
and performing corresponding resource allocation according to the result of the resource division.
Preferably, for the uplink: the first section frequency is 351-352 MHz, the second section frequency is 352-355 MHz, and the third section frequency is 355-356 MHz;
for the downlink: the first section frequency is 361-362 MHz, the second section frequency is 362-365 MHz, and the third section frequency is 365-366 MHz;
the first section of uplink frequency and the third section of uplink frequency are dynamically time-shared by the PDT system and the LTE system, and spectrum resources not occupied by PDT services are allocated to the LTE system for use.
Preferably, the performing the corresponding resource allocation according to the result of the resource division includes:
the control channels of the PDT system are centrally allocated to a location in the first and third segment frequencies that is remote from the second segment frequency.
Preferably, the performing the corresponding resource allocation according to the result of the resource division includes:
the LTE system does not transmit Sounding Reference Signals (SRS) within the PDT/LTE shared bandwidth.
Preferably, the performing the corresponding resource allocation according to the result of the resource division includes:
physical Random Access Channel (PRACH) resources are not allocated to the LTE system within the PDT/LTE shared bandwidth.
Preferably, the performing the corresponding resource allocation according to the result of the resource division includes:
and the PUCCH of the LTE system is ensured not to be in the PDT/LTE shared bandwidth by configuring the value of the physical uplink control channel PUCCH nRB-CQI of the LTE system to be more than 0.
Preferably, the performing the corresponding resource allocation according to the result of the resource division includes:
and radio bearer RB resources except the PRACH and the PUCCH are physical uplink shared channel PUSCH resources of the LTE system, a part of PUSCH resources are positioned in an LTE special bandwidth, a part of PUSCH resources are positioned in a PDT/LTE shared bandwidth, and only a PUSCH channel is positioned in the PDT/LTE shared bandwidth.
Preferably, when the LTE system performs PUSCH scheduling, voice traffic and guaranteed bit rate GBR traffic are preferentially allocated in an LTE dedicated bandwidth region; non-guaranteed bit rate NonGBR traffic is preferentially allocated in a PDT/LTE shared bandwidth area.
Preferably, the method further comprises:
for the PDT base station and the LTE base station which are co-located or co-covered, the PDT base station informs the LTE base station of the occupation situation of the uplink PDT resource through a PX2 interface.
Preferably, the method further comprises:
for a particular network, within the PDT/LTE shared bandwidth, if PDT frequency resources are not used, or during a period of time in which it is determined that PDT frequency resources are not used, the corresponding resources are statically configured for use by the LTE system.
According to the technical scheme, uplink 351-356 MHz and downlink 361-365 MHz are divided into 3 sections respectively, and the second section of frequency is used as a special LTE bandwidth and is distributed to an LTE system; the uplink first section frequency and the uplink third section frequency are PDT/LTE shared bandwidth and are shared by a PDT system and an LTE system; downstream first and third segment frequencies are assigned to the PDT system; the LTE system establishes an FDD cell with asymmetric bandwidth at uplink 351-356 MHz and downlink second-stage frequency, and finally performs corresponding resource allocation according to the resource division result, so that frequency spectrum resources not occupied by PDT service in PDT/LTE shared bandwidth can be allocated to the LTE system for use, thereby maximizing uplink resource utilization rate of PDT/LTE.
Drawings
FIG. 1 is a diagram illustrating the allocation of a conventional low-band spectrum in China;
FIG. 2 is a schematic diagram of a PDT current spectrum;
fig. 3 is a schematic diagram of spectrum sharing in existing PDT and LTE;
FIG. 4 is a schematic diagram of frequency allocation of PDT and LTE in the wide-narrow fusion system of the present invention;
fig. 5 is a schematic diagram of downlink frequency allocation of PDT and LTE in a wide-narrow fusion system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of uplink frequency allocation of PDT and LTE in a wide and narrow fusion system according to an embodiment of the present invention;
fig. 7 is a diagram illustrating PUCCH allocation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
In order to solve the problems in the prior art, the application provides a frequency allocation method for PDT and LTE in a wide and narrow fusion system, which comprises the following steps:
step 1: dividing UL 351-356 MHz and DL 361-365 MHz into 3 sections respectively, distributing the second section to an LTE system, and sharing the first section and the third section of an uplink as shared bandwidth by a PDT system and the LTE system; the first and third downstream segments are assigned to the PDT system.
A preferred frequency division and allocation is shown in fig. 4:
for the UL: the first section is 351-352 MHz, the second section is 352-355 MHz, and the third section is 355-356 MHz;
for DL: the first section is 361-362 MHz, the second section is 362-365 MHz, and the third section is 365-366 MHz.
The PDT/LTE system comprises a first section, a second section and a third section, wherein the first section and the third section are PDT/LTE shared bandwidth and are dynamically time-shared by the PDT system and the LTE system; the second segment is LTE dedicated bandwidth. Namely, 1M bandwidth is allocated to PDT at two sides of UL 351-356 MHz/DL 361-365 MHz frequency spectrum, and within the 2M bandwidth, the frequency spectrum resources not occupied by PDT service are allocated to LTE for use.
Step 2: the LTE system establishes FDD cells with asymmetric bandwidth: UL 351-356 MHz/DL 362-365 MHz TE, in an uplink 5M bandwidth, the middle 3M is fixed to be special for LTE, and the rest 2M is dynamic time division shared by LTE and PDT; the downlink 3M bandwidth is dedicated to LTE.
And step 3: and performing corresponding resource allocation according to the result of the resource division. Specifically, the division may be performed in the following manner:
first, PDT control channels are distributed in a position which is far away from a second section in 1M bandwidth of a first section and a third section in a centralized mode, so that PUSCH resources of PDT/LTE shared bandwidth are guaranteed to be continuous as much as possible.
Secondly, resource allocation is carried out in the UL 5M bandwidth according to the following modes:
1) sounding Reference Signal (SRS) resource allocation: the SRS is not transmitted within the PDT/LTE shared bandwidth, and therefore, functions such as frequency selective scheduling or VMIMO that rely on SRS measurement cannot be supported within the shared bandwidth, or functions such as frequency selective scheduling or VMIMO cannot obtain better performance gain.
2) Physical Random Access Channel (PRACH) resource allocation: PRACH resources are not allocated within the shared bandwidth.
3) Physical Uplink Control Channel (PUCCH) resource allocation: the PUCCH is guaranteed not to be in the shared bandwidth region but allocated in the 3M dedicated LTE region by PUCCH nRB-CQI configuration. In particular, it is possible to configure the device to be larger
(nRB-CQI) more RBs are configured for format 2 PUCCH carrying CQI. After configuring a large format 2 PUCCH RB space, the PUCCH transmission bandwidth can be fixed in the LTE-dedicated region without actually allocating RBs in the shared bandwidth (i.e., without allocating them for use by any UE).
Specifically, the nRB-CQI value may be configured as follows:
4) physical Uplink Shared Channel (PUSCH) scheduling: the RB resources except the PRACH and the PUCCH are PUSCH resources, a part of the PUSCH resources are located in an LTE special bandwidth, a part of the PUSCH resources are located in a PDT and LTE shared bandwidth area, and only PUSCH channels are located in the PDT and LTE shared bandwidth area.
When the LTE system carries out PUSCH scheduling, voice service and Guaranteed Bit Rate (GBR) service are preferentially distributed in an LTE special bandwidth so as to guarantee the real-time performance of the voice service; non-guaranteed bit rate (non gbr) traffic is preferentially allocated in PDT and LTE shared bandwidth areas.
5) For the PDT and LTE base stations with the same site or coverage, the PDT base station informs the LTE base station of the occupation situation of the uplink PDT resource through a PX2 interface. There is no need and possibility for frequency sharing for PDT and LTE base stations that are not co-sited or co-located.
6) PDT and LTE shared resources can be statically configured: for a particular network, within the PDT and LTE shared bandwidth, if PDT frequency resources are not used, or it is determined for some period of time that PDT frequency resources are not used, the corresponding resources may be statically configured for LTE use.
In addition, considering that the PDT downlink control channel needs to broadcast some common information and is in a frequent state, and the LTE downlink has a common control channel (such as PDCCH, PCFICH, PHICH, etc.) to be transmitted in a full-band wide frequency band, in such a case, if all downlink resources are dynamically shared, the PDT downlink transmission and the LTE downlink transmission may collide, and therefore, for the downlink resources, the present invention suggests that the PDT and the LTE each independently use the bandwidth.
The present application is illustrated by a preferred embodiment.
Examples of asymmetric bandwidth overall resource allocation of the present embodiment are shown in fig. 5 and 6. Fig. 5 is a schematic diagram of PDT and LTE downlink resource allocation; fig. 6 is a diagram illustrating PDT and LTE uplink resource allocation.
According to fig. 5, the LTE system occupies a middle 3M dedicated bandwidth, and the downlink control channel of the PDT system is allocated in the low frequency band of the first segment 1M bandwidth, and then the downlink data channel of the PDT. In order to avoid the conflict between the PDT downlink transmission and the LTE downlink transmission, the frequency resources not occupied by the PDT system are not allocated to the LTE system for use.
According to fig. 6, the LTE system occupies a middle 3M dedicated bandwidth, and the uplink control channel of the PDT system is allocated in the low frequency band of the first segment 1M bandwidth, followed by the uplink data channel of the PDT. And allocating the frequency resources not occupied by the PDT system to the LTE system for use.
An example of PUCCH allocation in this embodiment is shown in fig. 7, where each small square in fig. 7 represents an RB. Assuming configuration nRB-CQI of 5, the first 5 RBs starting with number 0 and the last 5 RBs starting with number 98 will be blank PUCCH regions (Blanked PUCCH), i.e.: these RBs will not be allocated to terminals for carrying PUCCH. And the blank PUCCH position which is not actually allocated to the terminal is used as PDT/LTE shared resource, and when the PDT does not occupy or partially occupies the spectrum, the unoccupied spectrum can be used as LTE PUSCH resource for uplink scheduling.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A frequency distribution method of PDT and LTE under a wide-narrow fusion system is characterized by comprising the following steps:
dividing uplink 351-356 MHz and downlink 361-365 MHz into 3 sections respectively, wherein the second section of frequency is LTE special bandwidth and is allocated to an LTE system; the uplink first section frequency and the uplink third section frequency are PDT/LTE shared bandwidth and are shared by a PDT system and an LTE system; downstream first and third segment frequencies are assigned to the PDT system;
the LTE system establishes an FDD cell with asymmetric bandwidth, wherein the uplink is established at 351-356 MHz, and the downlink is established at the second-stage frequency;
and performing corresponding resource allocation according to the result of the resource division.
2. The method of claim 1, wherein:
for the uplink: the first section frequency is 351-352 MHz, the second section frequency is 352-355 MHz, and the third section frequency is 355-356 MHz;
for the downlink: the first section frequency is 361-362 MHz, the second section frequency is 362-365 MHz, and the third section frequency is 365-366 MHz;
the first section of uplink frequency and the third section of uplink frequency are dynamically time-shared by the PDT system and the LTE system, and spectrum resources not occupied by PDT services are allocated to the LTE system for use.
3. The method according to claim 1 or 2, wherein said performing the corresponding resource allocation according to the result of the resource partitioning comprises:
the control channels of the PDT system are centrally allocated to a location in the first and third segment frequencies that is remote from the second segment frequency.
4. The method according to claim 1 or 2, wherein said performing the corresponding resource allocation according to the result of the resource partitioning comprises:
the LTE system does not transmit Sounding Reference Signals (SRS) within the PDT/LTE shared bandwidth.
5. The method according to claim 1 or 2, wherein said performing the corresponding resource allocation according to the result of the resource partitioning comprises:
not allocating Physical Random Access Channel (PRACH) resources for the LTE system within the PDT/LTE shared bandwidth.
6. The method according to claim 1 or 2, wherein said performing the corresponding resource allocation according to the result of the resource partitioning comprises:
and the PUCCH of the LTE system is ensured not to be in the PDT/LTE shared bandwidth by configuring the value of the physical uplink control channel PUCCH nRB-CQI of the LTE system to be more than 0.
7. The method according to claim 1 or 2, wherein said performing the corresponding resource allocation according to the result of the resource partitioning comprises:
and except for the PRACH and the PUCCH, the RB resources of the radio bearer are PUSCH resources of a physical uplink shared channel of the LTE system, a part of the PUSCH resources are positioned in an LTE special bandwidth, a part of the PUSCH resources are positioned in a PDT/LTE shared bandwidth, and only a PUSCH channel is positioned in the PDT/LTE shared bandwidth.
8. The method of claim 7, wherein:
when the LTE system carries out PUSCH scheduling, voice service and guaranteed bit rate GBR service are preferentially distributed in an LTE special bandwidth area; non-guaranteed bit rate NonGBR traffic is preferentially allocated in a PDT/LTE shared bandwidth area.
9. The method according to claim 1 or 2, characterized in that the method further comprises:
for the PDT base station and the LTE base station which are co-located or co-covered, the PDT base station informs the LTE base station of the occupation condition of the uplink PDT resource through a PX2 interface.
10. The method according to claim 1 or 2, characterized in that the method further comprises:
for a particular network, within the PDT/LTE shared bandwidth, if PDT frequency resources are not used, or during a period of time in which it is determined that PDT frequency resources are not used, the corresponding resources are statically configured for use by the LTE system.
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