Center frequency calculation method for multiple resource grids in 5g nr
By dynamically selecting a new reference center frequency, the problems of redundant calculation and insufficient collision detection in the existing technology are solved, realizing the universality and efficiency of 5G NR multi-resource grid center frequency calculation, and adapting to changes in the number of resource grids or channel bandwidth.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CEYEAR TECH CO LTD
- Filing Date
- 2024-12-19
- Publication Date
- 2026-06-04
Smart Images
Figure CN2024140597_04062026_PF_FP_ABST
Abstract
Description
A method for calculating the center frequency of a 5G NR multi-resource grid Technical Field
[0001] This invention belongs to the field of information technology, specifically relating to a method for calculating the center frequency of a 5G NR multi-resource grid. Background Technology
[0002] Under the same channel bandwidth, 5G NR (New Radio) networks can be configured with multiple resource grids with different subcarrier spacings (SCS). During transmission across multiple resource grids, the same channel center frequency is used, and the center frequencies of each resource grid are distributed around the mid-frequency range of the entire channel bandwidth. According to protocol requirements, multiple resource grids need to be aligned; that is, the subcarrier 0 of a resource block (RB) in any resource grid with a larger SCS must be aligned with the subcarrier 0 of a certain RB in any resource grid with a smaller SCS. Since different resource grids contain different numbers of RBs, and the number of RBs is not linearly related to the SCS, there will be resource grid initial RB offsets and resource grid center frequency offsets relative to the channel center frequency. Researching the calculation methods for the channel center frequency, resource grid initial RB offset, and resource grid center frequency offset of multiple resource grids is of great significance for 5G NR signal simulation and resource location determination.
[0003] The current solution only uses the subcarrier spacing combination specified by the 3GPP protocol to calculate the center frequency of the multi-resource grid, and the calculation process depends on a fixed subcarrier spacing combination.
[0004] In the specific calculation of the center frequency of multiple resource grids, the existing scheme first uses the center frequency of the resource grid with the largest subcarrier spacing as the reference center frequency, and then calculates the frequency offset of the center frequencies of the resource grids with smaller subcarrier spacings relative to the reference center frequency. If the current resource grid does not meet the frequency offset between the center frequencies of each resource grid specified in the 3GPP protocol, then... The requirement for a specific number of subcarriers is addressed by increasing the center frequency of the current resource grid by increasing the starting RB offset. In this operation, the number of subcarriers offset between the current resource grid center frequency and the reference center frequency is measured by the subcarrier offset of the current resource grid. For example, when the center frequency of a resource grid with a subcarrier spacing of 60 kHz is used as the reference center frequency, the number of subcarriers offset between the center frequency of a resource grid with a subcarrier spacing of 30 kHz and that center frequency is measured by 30 kHz.
[0005] If the center frequency of a resource grid with a small subcarrier spacing cannot satisfy the offset between the center frequencies of all resource grids no matter how much the initial RB offset is increased, then... If the requirement for each subcarrier is met, the initial RB offset of the resource grid with the largest subcarrier spacing is increased. The reference center frequency value is also increased accordingly. Then, the frequency offset of the resource grid center frequency with smaller subcarrier spacings relative to the new reference center frequency is recalculated. This process is repeated until the offset between the center frequencies of each resource grid is [value missing]. Subcarriers.
[0006] The existing scheme is only applicable to subcarrier spacing combinations within the FR1 or FR2 bands specified in the 3GPP protocol. During the calculation process, the center frequency of the resource grid with the largest subcarrier spacing is always used as the reference center frequency. Even if some resource grids cannot meet the center frequency offset requirement... The requirement for each subcarrier requires first recalculating the center frequency of the resource grid with the largest subcarrier spacing as the new reference center frequency, and then sequentially calculating the frequency offset of the resource grids with smaller subcarrier spacings relative to the new reference center frequency. This leads to unnecessary recalculation. For example, when the center frequency of a resource grid with a smaller subcarrier spacing is greater than the reference center frequency due to a larger initial RB offset, this center frequency can be directly used as the new reference center frequency, and the initial RB offset of the resource grid with the larger subcarrier spacing can be increased, without having to use the center frequency of the resource grid with the larger subcarrier spacing as the new reference center frequency.
[0007] Meanwhile, when the number of resource grids changes or the channel bandwidth changes due to network configuration, the offset between the center frequencies of each resource grid may not meet the requirements. The requirement of individual subcarriers means that collisions occur, and existing solutions lack effective collision detection mechanisms. Technical issues
[0008] In summary, the current method for calculating the center frequency of 5G NR multi-resource grid has the following shortcomings:
[0009] 1. It only applies to the subcarrier spacing combinations of the FR1 or FR2 frequency bands that are already defined in the 3GPP protocol. It cannot effectively calculate the center frequency for multi-resource grids composed of undefined or more general subcarrier spacing combinations, and its versatility is somewhat lacking.
[0010] 2. During the calculation process, since the center frequency of the resource grid with the largest subcarrier spacing is always used as the reference center frequency, unnecessary recalculation may occur, which not only increases the computational complexity but also affects the computational efficiency.
[0011] 3. Lack of an effective collision detection mechanism; when the number of resource grids or channel bandwidth changes, it cannot effectively detect whether the offset between the center frequencies of each resource grid meets the requirements. The requirement for one subcarrier. Technical solutions
[0012] In view of the above-mentioned technical problems in the existing technology, the present invention proposes a 5G NR multi-resource grid center frequency calculation method, which is reasonably designed, overcomes the shortcomings of the existing technology, and has good effect.
[0013] To achieve the above objectives, the present invention adopts the following technical solution:
[0014] A method for calculating the center frequency of a 5G NR multi-resource grid, where the channel bandwidth of a 5G NR cell is denoted as... The number of resource grids is ,in The number of resource blocks (RBs) in each resource grid is ,in, The subcarrier spacing is , Different; resource grid The starting RB offset is Its center frequency is According to the channel resource allocation principles in the communication process, The value should satisfy Resource grid The offset of the center frequency relative to the channel center frequency is There are several subcarriers, and according to the 3GPP protocol, when the resource grid is aligned, there are... ,and ;
[0015] Specifically, the steps include the following:
[0016] Step 1: Calculate the channel center frequency;
[0017] Step 2: Conflict detection when the number of resource grids changes;
[0018] By determining the number of subcarriers offset between the center frequency of each resource grid and the current center frequency, resource conflicts can be effectively detected and handled.
[0019] Step 3: Collision detection when channel bandwidth changes;
[0020] By determining whether the transmission bandwidth of each resource grid is greater than the changed channel bandwidth, and whether the offset between the intermediate frequency of the channel bandwidth and the center frequency of the resource grid is greater than one resource block, resource conflicts can be effectively detected and handled.
[0021] Preferably, step 1 specifically includes the following steps:
[0022] Step 1.1: Calculate the initial center frequency of each resource grid. If they are not all the same, record the resource grid with the largest initial center frequency.
[0023] Step 1.2: From the first Starting with one resource grid, sequentially... Increment the value by 1, and update the resource grid with the highest center frequency;
[0024] Step 1.3: Repeat steps 1.1-1.2 until a resource grid is found. Center frequency and resource grid The offset between center frequencies is 0 or ±6 resource grids. The subcarrier, at this time the resource grid The center frequency is the channel center frequency; when a resource grid's... The value makes At that time, the resource grid resources exceeded the channel bandwidth, and it was determined that the channel center frequency had not been found.
[0025] Preferably, step 2 specifically includes the following steps:
[0026] Step 2.1: Sequentially determine the number of subcarriers offset between the center frequency of each resource grid and the current center frequency. If there are more than [number of subcarriers], [then the process continues]. If the scope is limited, then a conflict is considered to exist;
[0027] Step 2.2: Recalculate the starting RB and subcarrier offset values for each resource grid.
[0028] Preferably, step 3 specifically includes the following steps:
[0029] Step 3.1: Sequentially determine whether the transmission bandwidth of each resource grid is greater than the changed channel bandwidth, and whether the offset between the intermediate frequency of the channel bandwidth and the center frequency of the resource grid is greater than one resource block. If either of these conditions exists, a conflict is considered to exist.
[0030] Step 3.2: Recalculate the starting RB and subcarrier offset values for each resource grid. Beneficial effects
[0031] The beneficial technical effects of this invention are as follows:
[0032] 1. The 5G NR multi-resource grid center frequency calculation method proposed in this invention is not limited by specific subcarrier spacing and the number of RBs. It is not only compatible with the fixed subcarrier spacing combination described in the existing 3GPP protocol, but also has a certain degree of scalability for protocol evolution and technology development.
[0033] 2. The 5G NR multi-resource grid center frequency calculation method proposed in this invention effectively solves the problem of redundant calculation by dynamically selecting a new reference center frequency and avoiding repeated calculations starting from the resource grid with the largest subcarrier spacing.
[0034] 3. The 5G NR multi-resource grid center frequency calculation method proposed in this invention can effectively detect and handle resource conflicts when the number of resource grids in the network changes by judging the number of subcarriers offset between the center frequency of each resource grid and the current center frequency.
[0035] 4. The 5G NR multi-resource grid center frequency calculation method proposed in this invention can effectively detect and handle resource conflicts when the channel bandwidth of the network changes. This is achieved by determining whether the transmission bandwidth of each resource grid is greater than the changed channel bandwidth and whether the offset between the intermediate frequency of the channel bandwidth and the center frequency of the resource grid is greater than one resource block. Attached Figure Description
[0036] Figure 1 is a flowchart for calculating the channel center frequency;
[0037] Figure 2 is a flowchart of the resource conflict judgment method when the number of resource grids changes;
[0038] Figure 3 is a flowchart of the resource conflict judgment method when the channel bandwidth changes. Embodiments of the present invention
[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0040] Let the channel bandwidth of the 5G NR cell be... The number of resource grids is ,in The number of RBs in each resource grid is... Subcarrier spacing (SCS) is , They vary. Resource grid The starting RB offset is Its center frequency is According to the channel resource allocation principles in the communication process, The value should satisfy Resource Grid The offset of the center frequency relative to the channel center frequency is There are several subcarriers, and according to the 3GPP protocol, when the resource grid is aligned, there are... ,and .
[0041] According to the 3GPP protocol, for 5G NR cells operating in the FR1 and FR2 bands, under different channel bandwidths, the resource grid... The relationship between the number of SCSs and the number of RBs is shown in Tables 1 and 2, respectively. In the tables, N / A indicates that the corresponding SCS is not supported under that channel bandwidth, meaning that the resource grid for that SCS does not exist. As can be seen from the two tables, regardless of whether it is the FR1 or FR2 band, under the same channel bandwidth, the larger the resource grid SCS, the smaller its number of RBs, and the smaller the resource grid of the SCS... The value is not less than the resource grid of the larger SCS. On the other hand, with the same resource grid SCS, the larger the channel bandwidth, the larger the number of RBs.
[0042] Table 1
[0043]
[0044] Table 2
[0045]
[0046] 1. Channel center frequency calculation
[0047] In this scheme, the channel center frequency calculation assumes that the channel bandwidth, the number of resource grids, the number of RBs in each resource grid, and the SCS parameters are all known. Based on the principle that multiple resource grids have the same channel center frequency, it is assumed that... The initial values for all resources are 0, and then some resource grids are adjusted appropriately. The value is maintained until the channel center frequency of all resource grids is the same, at which point the offset of the center frequency of each resource grid relative to the channel center frequency is 0 or ±6 subcarriers.
[0048] First, calculate the initial center frequency of each resource grid. If they are not all the same, record the resource grid with the highest initial center frequency. Then, starting from the... Starting with one resource grid, sequentially... Increment the value by 1, and simultaneously update the resource grid with the highest center frequency. Repeat the above steps until a resource grid is found. Center frequency and resource grid The offset between center frequencies is 0 or ±6 resource grids. The subcarrier, at this time the center frequency of the resource grid is the channel center frequency. When a certain resource grid's subcarrier... Value makes time The resource grid resources exceeded the channel bandwidth, indicating that the channel center frequency could not be found.
[0049] The detailed steps (as shown in Figure 1) are explained below:
[0050] 1) Initialization , ;
[0051] 2) If Then let , Execute step 3); otherwise execute step 5).
[0052] 3) If Then let ;
[0053] 4) Execute 2);
[0054] 5) Order ;
[0055] 6) If If yes, execute step 7); otherwise, execute step 10).
[0056] 7) ;
[0057] 8) If If yes, execute step 9); otherwise, execute step 11).
[0058] 9) If or Then let , Execute 6); otherwise if Then let Execute 5); otherwise, let , Execute 7);
[0059] 10) Output The channel center frequency is used, and the output of each resource grid is given. Value and Value, execute 12);
[0060] 11) Channel center frequency not found;
[0061] 12) End.
[0062] in For absolute value functions:
[0063] When the number of resource grids changes, the offset between the center frequency of the resource grids and the channel center frequency may not always be 0 or ±6 subcarriers, leading to resource conflicts. When the channel bandwidth changes, the center frequency of the entire channel bandwidth changes, and the offset between the center frequency of the channel bandwidth and the center frequency of the resource grids is greater than one resource block, thus requiring a recalculation of the channel center frequency. Furthermore, the sum of the number of resource blocks (RBs) in the resource grids and the initial RB offset may exceed the new channel bandwidth, also resulting in resource conflicts. The methods for determining resource conflicts after changes in the number of resource grids and the channel bandwidth are explained below.
[0064] Let the number of resource grids after the change be . The center frequency, number of RBs, and SCS of the newly added resource grid are respectively , and And the offset of the center frequency relative to the channel center frequency is One subcarrier. The starting RB offset of the newly added resource grid before collision resolution. Therefore, the frequency of the new resource grid center is increased. .
[0065] The detailed steps for determining resource conflicts (as shown in Figure 2) are explained below:
[0066] 1) Initialization ;
[0067] 2) If If the condition is met, then proceed to step 3); otherwise, the process ends.
[0068] 3) ;
[0069] 4) If and Then the resource grid There is a resource conflict;
[0070] 5) Execute 2).
[0071] in It is an absolute value function.
[0072] Let the changed channel bandwidth be . The detailed steps for determining resource conflicts (as shown in Figure 3) are explained below:
[0073] 1) Initialization ;
[0074] 2) If If the condition is met, then proceed to step 3); otherwise, the process ends.
[0075] 3) ;
[0076] 4) If or Then the resource grid There is a resource conflict;
[0077] 5) Execute 2).
[0078] in It is an absolute value function.
[0079] If the number of resource grids or the channel bandwidth changes, and at least one resource grid experiences a resource conflict, the channel center frequency and the resource grids for each resource grid should be recalculated using the method described in Part 1. Value and value.
[0080] Key Points and Protection Points 1. A General Method for Calculating the Center Frequency of 5G NR Multi-Resource Grid
[0081] Based on the analysis of subcarrier spacing combinations specified in the 3GPP protocol, this invention proposes a general method for calculating the center frequency of 5G NR multi-resource grid, applicable to various situations where the relationship between subcarrier spacing and center frequency is not linear. This method is not only compatible with the fixed subcarrier spacing combinations described in existing 3GPP protocols, but also possesses a certain degree of scalability for protocol evolution and technological development.
[0082] Key Point and Protection Point 2: During the center frequency calculation process, the maximum center frequency is dynamically selected as the reference center frequency to avoid redundant calculations.
[0083] The 5G NR multi-resource grid center frequency calculation method proposed in this invention finds the maximum center frequency of each resource grid as the reference center frequency during the initialization phase. In subsequent calculations, as the initial RB offset of each resource grid increases, if the center frequency of a certain resource grid is greater than the reference center frequency, the center frequency of that resource grid is dynamically used as the new reference center frequency. This avoids repeatedly starting the calculation from the resource grid with the largest subcarrier spacing, effectively solving the problem of redundant calculations.
[0084] Key Points and Protection Points 3: Scalable and Efficient 5G NR Multi-Resource Mesh Center Frequency Calculation Method
[0085] The method proposed in this invention uses a symbolic approach to describe the calculation process of the center frequency of multiple resource grids with different subcarrier spacings, resource block numbers, and starting RB offsets. It is not limited by specific subcarrier spacings and RB numbers, and possesses good versatility and scalability. Furthermore, by dynamically selecting a new reference center frequency during the calculation process, redundant calculations can be avoided, allowing for the rapid acquisition of the center frequencies of multiple resource grids.
[0086] Key Points and Protection Points 4: Conflict Detection Methods When Resource Grid Quantity Changes
[0087] The 5G NR multi-resource grid center frequency calculation method proposed in this patent can effectively detect resource conflicts when the number of resource grids changes. When the number of resource grids changes, the offset between the center frequency of each resource grid and the current center frequency may not all be 0 or ±6 subcarriers, which is considered a resource conflict. In this case, the number of subcarriers offset between the center frequency of each resource grid and the current center frequency is sequentially determined. If there is an excess... If the range is such that a conflict exists, then the starting RB and subcarrier offset values for each resource grid are recalculated using the aforementioned center frequency calculation method.
[0088] Key Points and Protection Points 5: Collision Detection Methods When Channel Bandwidth Changes
[0089] The 5G NR multi-resource grid center frequency calculation method proposed in this patent can effectively detect resource conflicts when the channel bandwidth changes. Changes in channel bandwidth cause a change in the intermediate frequency of the entire channel. If the offset between the intermediate frequency and the current center frequency is greater than one resource block, the channel center frequency must be recalculated. On the other hand, the sum of the number of resource grid blocks (RBs) and the initial RB offset may be greater than the changed channel bandwidth, leading to resource conflicts. In this case, the method sequentially checks whether the transmission bandwidth of each resource grid is greater than the changed channel bandwidth and whether the offset between the intermediate frequency of the channel bandwidth and the center frequency of the resource grid is greater than one resource block. If either of these conditions exists, a conflict is considered to exist, and the aforementioned center frequency calculation method is used to recalculate the initial RB and subcarrier offset values for each resource grid.
[0090] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. A method for calculating the center frequency of a 5G NR multi-resource grid, characterized in that: Let the channel bandwidth of the 5G NR cell be... The number of resource grids is ,in The number of RBs in each resource grid is ,in, The subcarrier spacing is , Different; resource grid The starting RB offset is Its center frequency is According to the channel resource allocation principles in the communication process, The value should satisfy Resource grid The offset of the center frequency relative to the channel center frequency is There are several subcarriers, and according to the 3GPP protocol, when the resource grid is aligned, there are... ,and ; Specifically, the steps include the following: Step 1: Calculate the channel center frequency; Step 2: Conflict detection when the number of resource grids changes; By determining the number of subcarriers offset between the center frequency of each resource grid and the current center frequency, resource conflicts can be effectively detected and handled. Step 3: Collision detection when channel bandwidth changes; By determining whether the transmission bandwidth of each resource grid is greater than the changed channel bandwidth, and whether the offset between the intermediate frequency of the channel bandwidth and the center frequency of the resource grid is greater than one resource block, resource conflicts can be effectively detected and handled.
2. The 5G NR multi-resource grid center frequency calculation method according to claim 1, characterized in that: Step 1 specifically includes the following steps: Step 1.1: Calculate the initial center frequency of each resource grid. If they are not all the same, record the resource grid with the largest initial center frequency. Step 1.2: From Starting with the first resource grid, sequentially... Increment the value by 1, and update the resource grid with the highest center frequency; Step 1.3: Repeat steps 1.1-1.2 until a resource grid is found. Center frequency and resource grid The offset between center frequencies is 0 or ±6 resource grid subcarriers, at which point the center of the resource grid... The frequency is the center frequency of the channel; when a certain resource grid's Value makes time The resource grid resources exceeded the channel bandwidth, indicating that the channel center frequency could not be found.
3. The 5G NR multi-resource grid center frequency calculation method according to claim 1, characterized in that: Step 2 specifically includes the following steps: Step 2.1: Sequentially determine the number of subcarriers offset between the center frequency of each resource grid and the current center frequency. If there are more than [number of subcarriers], [then the process continues]. If the scope is limited, then a conflict is considered to exist; Step 2.2: Recalculate the starting RB and subcarrier offset values for each resource grid.
4. The 5G NR multi-resource grid center frequency calculation method according to claim 1, characterized in that: Step 3 specifically includes the following steps: Step 3.1: Sequentially determine whether the transmission bandwidth of each resource grid is greater than the changed channel bandwidth, and whether the offset between the intermediate frequency of the channel bandwidth and the center frequency of the resource grid is greater than one resource block. If either of these conditions exists, a conflict is considered to exist. Step 3.2: Recalculate the starting RB and subcarrier offset values for each resource grid.